18 Aug is in August.
On 18 Aug 1275 Bartholomew Badlesmere 1st Baron Badlesmere was born to Gunselin Badlesmere and Joan Fitzbernard.
On 18 Aug 1304 John Capet II Duke Brittany (age 65) fought during the Battle of Mons en Pévèle.
Before 18 Aug 1347 Edmund St John 3rd Baron St John Basing (age 13) and Elizabeth Strange Baroness St John Basing were married. She by marriage Baroness St John Basing. She a great x 4 granddaughter of King John "Lackland" of England. 
On 18 Aug 1347 Edmund St John 3rd Baron St John Basing (age 13) died at Calais [Map]. His sister Isabel St John 4th Baroness St John Basing (age 14) succeeded 4th Baroness St John Basing.
On 18 Aug 1430 Thomas Ros 8th Baron Ros Helmsley (age 22) died. His son Thomas Ros 9th Baron Ros Helmsley (age 2) succeeded 9th Baron Ros Helmsley.
On 18 Aug 1471 George Gordon 2nd Earl Huntley (age 16) and Elizabeth Hay Countess Huntley (age 21) were married; she having been his mistress. She by marriage Countess Huntley. She the daughter of William Hay 1st Earl Erroll and Beatrice Douglas Countess Erroll. He the son of Alexander Gordon 1st Earl Huntley and Elizabeth Crichton Countess Huntley (age 61).
On 18 Aug 1477 Maximilian Habsburg I Holy Roman Emperor (age 18) and Mary Valois Duchess Burgundy (age 20) were married at Ghent. She the daughter of Charles "Bold" Valois Duke Burgundy and Isabella Bourbon. He the son of Frederick "Peaceful or Fat" Habsburg III Holy Roman Emperor (age 61) and Eleanor Aviz Holy Roman Empress. They were second cousins. He a great x 3 grandson of King Edward III of England. She a great x 3 granddaughter of King Edward III of England.
On 18 Aug 1510 Edmund Plunkett 3rd Baron Killeen (age 61) died. His son John Plunkett 4th Baron Killeen succeeded 4th Baron Killeen.
After 18 Aug 1512 . St Andrew's Church Blickling [Map]. Memorial brass to Anne Wood aka Wode.
The inscription ... Orate p[ro] a[n]i[m]a Anne a wode ux[oris] s[e]cu[n]de Tho[m]e Asteley de Melton Constable. Armig[eri], que in die s[an]c[t]i Agapiti Martyris masculu[m] et femella[m] ad partu[m] pep[er]it et
Anne Wood aka Wode: She was born to John Wood aka Wode. Before 1507 Thomas Astley of Hilmorton and Melton Constable (age 38) and she were married. In On or after 18 Aug 1512 Anne Wood aka Wode died in childbirth whilst visiting her sister Elizabeth at Blickling. She was buried in St Andrew's Church Blickling
On 18 Aug 1524 Richard Cornwall 9th Baron Burford (age 31) and Janet Wogan (age 31) were married at Wiston.
On 18 Aug 1542 Charles Neville 6th Earl of Westmoreland was born to Henry Neville 5th Earl of Westmoreland (age 17) and Anne Manners Countess of Westmoreland (age 15).
Henry Machyn's Diary. 18 Aug 1553. The xviij day of August was reynyd at Westmynster hall the marqwes of Northamton (age 41), and the duke (age 49), and th'erle of Warwyke (age 26), and so they wher condemnyd to be had to the place that thay cam fro, and from thens to be drane thrugh London onto Tyburne [Map], and ther to be hangyd, and then to be cott downe, and ther bowells to be brentt, and ther heds to be sett on London bryge and odur [places.]
On 18 Aug 1553 John Dudley 1st Duke Northumberland (age 49) and John Dudley 2nd Earl Warwick (age 26) were tried at Westminster Hall [Map].
Thomas Howard 3rd Duke of Norfolk (age 80) presided at the trial.NOTEXT
Wriothesley's Chronicle. 18 Aug 1554. Saterdaye the 18 of August, in the after-noone, the King (age 27) and Queenes (age 38) Majesties rode throughe Sowthwerke, over the bridge [Map], and so throughe London; where they were with great provision receaved of the citizens, pageants in places accustomed, the crosse in Cheape [Map] new gilte, &c.
Memorandum: In the moneth of September the Duke of Norfolke (age 81) died at Framlingham [Map] in Norfolke, and there was honorablye buried [Map] amongst his auncestors.NOTEXT
Allso this moneth the Bishop of London (age 54) visited all his dioces, and had sermons in everie parishe and place where he satt, and sett owt divers goodlye articles in print for the true religion.
Allso he commaunded that the feast of everie saynte that was patrone of the churche, called Festum loci in everie parishe, should be kept holiedaye in everie parishe throughe his diocesse as a principall feast used in olde tyme, after the custome of the churche.
On 18 Aug 1562 John Mordaunt 1st Baron Mordaunt (age 82) died at Bedford [Map]. His son John Mordaunt 2nd Baron Mordaunt (age 54) succeeded 2nd Baron Mordaunt 1C 1529.
On 31 Aug 1565 George Vernon "King of the Peak" (age 57) died. He was buried at All Saint's Church, Bakewell, Derbyshire [Map]. By his will of 18 Aug 1565 he bequeathed six Derbyshire manors and two in Staffordshire to his wife for life. His executors were to take the profits of his manor of Kibblestone, in Staffordshire, and two Cheshire manors for 16 years after his decease to pay his debts, funeral expenses and the fulfilment of his will, which included among numerous bequests the provision of one gold chain worth £20 to his godson, Gilbert Talbot (age 12), the future 6th Earl of Shrewsbury, 'as a remembrance of my good will towards him'. His wife, his son-in-law John Manners (age 38), his brother-in-law Nicholas Longford (age 33) and his 'loving neighbours and faithful friends Thomas Sutton and Richard Wennesley were each to receive £20 for their services as executors, while his 'right worshipful friends' (Sir) John Zouche II and Francis Leke (age 55) were each to have a horse.
Monument with both his wives Margaret Tailboys and Maud aka Magdelan Longford each wearing a French Hood. Man with Two Wives.
On the left the arms of his second wife Margaret Tailboys, middle the arms of George Vernon "King of the Peak" (age 57) and right the arms of his first wife Maud aka Magdelan Longford.
On 18 Aug 1572 Henry IV King France (age 18) and Margaret Valois Queen Consort France (age 19) were married. She by marriage Queen Consort of France. She the daughter of King Henry II of France and Catherine Medici Queen Consort France (age 53). He the son of Antoine King Navarre and Jeanne Albret III Queen Navarre. They were second cousins.
On 18 Aug 1580 Robert Douglas Earl Buchan (age 40) died. His son James Douglas 5th Earl Buchan succeeded 5th Earl Buchan 3C 1469.
On 18 Aug 1604 the Treaty of London was signed concluding the nineteen-year Anglo-Spanish War. The treaty restored the 'Status quo' between the two nations. The negotiations probably took place at Somerset House [Map] in Westminster and are sometimes known as the Somerset House Conference.
On 23 Jul 1611 Frances Sutton 6th Baroness Dudley was born to Ferdinando Dudley (age 23) and Honora Seymour (age 18) at Dudley Castle [Map]. She was baptised 18 Aug 1611 at the same place.
On 18 Aug 1625 Edward Zouche 11th Baron Zouche Harringworth (age 69) died. Baron Zouche Harringworth abeyant between his two daughters Elizabeth Zouche and Mary Zouche (age 43).
On 18 Aug 1627 Bishop William Lloyd was born in Tilehurst.
Calendars. 18 Aug 1662. 59. -- to [Lord Conway]. Welcomes him to Dublin. Hopes he has received the tender of his brother Dering's service. The Doctors are both at Tunbridge, and are going to Italy. The writer's cousin, Hugh Cholmley (age 30), has fought a duel with Edward Montague (age 27), without harm, and Henry Jermyn (age 26) and Giles Rawlins against one of the Howards (age 31) and Lord Dillon's son; it was fought in St. James's Fields, Pall Mall, at 11am. Rawlins is slain, Jermyn (age 26) wounded, and the other two fled. The King intends to proclaim Tangiers a free port for five years. The London ministers who will not conform have parted from their congregations with great temper. Damaged.
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Pepy's Diary. 18 Aug 1665. Thence in Commissioner Pett's (age 55) coach (leaving them there). I late in the darke to Gravesend [Map], where great is the plague, and I troubled to stay there so long for the tide.
Evelyn's Diary. 18 Aug 1672. Sir James Hayes (age 35), Secretary to Prince Rupert (age 52), dined with me; after dinner I was sent to Gravesend [Map] to dispose of no fewer than 800 sick men. That night I got to the fleet at the Buoy of the Nore, where I spoke with the King (age 42) and the Duke (age 38); and, after dinner next day, returned to Gravesend [Map].
Evelyn's Diary. 18 Aug 1673. It was reported with these particulars, that, causing his servant to leave him unusually one morning, locking himself in, he strangled himself with his cravat upon the bed-tester; his servant, not liking the manner of dismissing him, and looking through the keyhole (as I remember), and seeing his master hanging, broke in before he was quite dead, and taking him down, vomiting a great deal of blood, he was heard to utter these words: "Well; let men say what they will, there is a God, a just God above"; after which he spoke no more. This, if true, is dismal. Really, he was the chief occasion of the Dutch war, and of all that blood which was lost at Bergen in attacking the Smyrna fleet, and that whole quarrel.
Evelyn's Diary. 18 Aug 1673. And I the rather am confident of it, remembering what Sir Edward Walker (age 62) (Garter King at Arms) had likewise affirmed to me a long time before, even when he was first made a Lord; that carrying his pedigree to Lord Clifford (age 43) on his being created a peer, and, finding him busy, he bade him go into his study and divert himself there till he was at leisure to discourse with him about some things relating to his family; there lay, said Sir Edward, on his table, his horoscope and nativity calculated, with some writing under it, where he read that he should be advanced to the highest degree in the state that could be conferred upon him, but that he should not long enjoy it, but should die, or expressions to that sense; and I think, (but cannot confidently say) a bloody death. This Sir Edward (age 62) affirmed both to me and Sir Richard Browne; nor could I forbear to note this extraordinary passage in these memoirs.
Evelyn's Diary. 18 Aug 1673. My Lord Clifford (age 43), being about this time returned from Tunbridge [Map], and preparing for Devonshire, I went to take my leave of him at Wallingford House; he was packing up pictures, most of which were of hunting wild beasts and vast pieces of bull-baiting, bear-baiting, etc. I found him in his study, and restored to him several papers of state, and others of importance, which he had furnished me with, on engaging me to write the "History of the Holland War", with other private letters of his acknowledgments to my Lord Arlington (age 55), who from a private gentleman of a very noble family, but inconsiderable fortune, had advanced him from almost nothing. The first thing was his being in Parliament, then knighted, then made one of the Commissioners of sick and wounded, on which occasion we sat long together; then, on the death of Hugh Pollard, he was made Comptroller of the Household and Privy Councillor, yet still my brother Commissioner; after the death of Lord Fitz-Harding, Treasurer of the Household, he, by letters to Lord Arlington (age 55), which that Lord showed me, begged of his Lordship to obtain it for him as the very height of his ambition. These were written with such submissions and professions of his patronage, as I had never seen any more acknowledging. The Earl of Southampton then dying, he was made one of the Commissioners of the Treasury. His Majesty (age 43) inclining to put it into one hand, my Lord Clifford (age 43), under pretense of making all his interest for his patron, my Lord Arlington (age 55), cut the grass under his feet, and procured it for himself, assuring the King (age 43) that Lord Arlington (age 55) did not desire it. Indeed, my Lord Arlington (age 55) protested to me that his confidence in Lord Clifford (age 43) made him so remiss and his affection to him was so particular, that he was absolutely minded to devolve it on Lord Clifford (age 43), all the world knowing how he himself affected ease and quiet, now growing into years, yet little thinking of this go-by. This was the great ingratitude Lord Clifford (age 43) showed, keeping my Lord Arlington (age 55) in ignorance, continually assuring him he was pursuing his interest, which was the Duke's (age 39) into whose great favor Lord Clifford (age 43) was now gotten; but which certainly cost him the loss of all, namely, his going so irrevocably far in his interest.
On 18 Aug 1683 Christian Ernst Saxe Coburg Saalfeld IV Duke Saxe Coburg Saalfeld was born to John Ernest Saxe Coburg Saalfeld IV Duke Saxe Coburg Saalfeld (age 24) and Sophie Hedwig Saxe Merseburg Duchess Saxe Coburg Saalfeld at Saalfield.
On 18 Aug 1687 Edward Radclyffe 2nd Earl Derwentwater (age 32) and Mary Tudor Countess Derwentwater (age 13) were married. She the daughter of King Charles II of England Scotland and Ireland and Mary "Moll" Davis (age 39). He the son of Francis Radclyffe 1st Earl Derwentwater (age 62).
On 18 Aug 1692 Louis Henri Bourbon Condé Duke Bourbon was born to Louis Bourbon Condé (age 23) and Louise Françoise Bourbon (age 19). He a great x 3 grandson of King James I of England and Ireland and VI of Scotland.
On 18 Aug 1692 John Vaughan 1st Viscount Lisburne (age 24) and Malet Wilmot Viscountess Lisburne (age 16) were married. She the daughter of John Wilmot 2nd Earl Rochester and Elizabeth Malet Countess Rochester.
On 18 Aug 1696 Bourchier Wrey 4th Baronet (deceased) was buried at St Peter's Church, Tawstock [Map]. Inscription: Juxta hoc Marmor depositæ sunt Reliquiæ Bourchieri Wrey Baronetti Honorabilis ordinis Balnei Mitiris Egregys animi dotibus Fortitudine præfertim et amicitia Insignis Ecclesiae pietate, Regi Fidelitate Conspicui filius erat naru Maximus Chichesteri Wrey de Trebeigh, in agro Cornubienfi Baronetti, E Conjuge Comitissa Middlesex (age 65) Filia Edvardi Comitis Bathon de antigua et perillustri Bourchierum strirpe nuper extincta Obijt 28vo die July Anno Domu 1696 Ætatis 44to Spe Beatae Resurrectionis.
On 18 Aug 1707 William Cavendish 1st Duke Devonshire (age 67) died. His son William Cavendish 2nd Duke Devonshire (age 35) succeeded 2nd Duke Devonshire, 5th Earl Devonshire 2C 1618. Rachel Russell Duchess Devonshire (age 33) by marriage Duchess Devonshire.
On 18 Aug 1712 Richard Savage 4th Earl Rivers (age 58) died. His half first cousin John Savage 5th Earl Rivers (age 47) succeeded 5th Earl Rivers 2C 1626, 5th Viscount Colchester, 5th Viscount Savage, 5th Baron Darcy of Chiche, 6th Baronet Savage of Rocksavage in Cheshire.
On 18 Aug 1720 Laurence Shirley 4th Earl Ferrers was born to Laurence Shirley (age 26) and Anne Clarges (age 25).
Before 18 Aug 1728 James Caulfield 3rd Viscount Charlemont and Elizabeth Bernard Viscountess Caulfield (age 25) were married.
On 18 Aug 1728 James Caulfield 1st Earl Charlemont was born to James Caulfield 3rd Viscount Charlemont and Elizabeth Bernard Viscountess Caulfield (age 25).
On 18 Aug 1746 William Boyd 4th Earl Kilmarnock (age 41) was executed at Tower Hill [Map]. He was was buried at St Peter ad Vincula Church, Tower of London [Map].
On 18 Aug 1748 John Freeman-Mitford 1st Baron Redesdale was born to John Mitford Barrister (age 60).
On 18 Aug 1765 Francis I Holy Roman Emperor (age 56) died.
On 18 Aug 1770 John Bellew 4th Baron Bellew (age 68) died. Baron Bellew of Duleek 1C 1686 extinct.
On 18 Aug 1776 Thomas Howard 16th Earl Suffolk 9th Earl Berkshire was born to John Howard 15th Earl Suffolk (age 37) and Julia Gaskarth (age 39).NOTEXT
On 18 Aug 1787 Charles Compton 1st Marquess Northampton (age 27) and Maria Smith Marchioness Northampton (age 21) were married. He the son of Spencer Compton 8th Earl of Northampton (age 49) and Jane Lawton Countess Northampton.
On 18 Aug 1806 Thomas Foley 3rd Baron Foley (age 25) and Cecilia Olivia Geraldine Fitzgerald Baroness Foley (age 20) were married at Boyle Farm Kingston Upon Thames, Surrey. She by marriage Baroness Foley of Kidderminster in Worcestershire. She the daughter of William Robert Fitzgerald 2nd Duke Leinster and Emilia St George Duchess Leinster. They were fourth cousins. He a great x 3 grandson of King Charles II of England Scotland and Ireland. She a great x 3 granddaughter of King Charles II of England Scotland and Ireland. 
On 18 Aug 1825 John Townshend 4th Marquess Townshend (age 27) and Elizabeth Jane Stuart (age 22) were married.
On 18 Aug 1825 Charles Augustus North (age 40) died.
On 18 Aug 1828 Henry Pelham 3rd Earl Chichester (age 23) and Mary Brudenell Countess Chichester (age 22) were married at St Mary's Church Cadogan Street. She by marriage Countess Chichester. She the daughter of Robert Brudenell 6th Earl Cardigan (age 59) and Penelope Cooke Countess Cardigan. He the son of Thomas Pelham 2nd Earl Chichester and Mary Henrietta Juliana Osborne Countess Chichester (age 51).
On 18 Aug 1831 John Paulet 14th Marquess Winchester (age 30) and Caroline Ramsden were married. He the son of Charles Burroughs-Paulet 13th Marquess Winchester (age 67) and Anne Andrews Marchioness of Winchester (age 58).
On 18 Aug 1840 Henry Thomas Petty-Fitzmaurice 4th Marquess Lansdowne (age 24) and Georgiana Herbert (age 23) were married. She died six months later. She the daughter of George Augustus Herbert 11th Earl Pembroke 8th Earl Montgomery and Yekaterina Semyonovna Vorontsova Countess Pembroke and Montgomery (age 55). He the son of Henry Petty-Fitzmaurice 3rd Marquess Lansdowne (age 60) and Louisa Fox-Strangways Marchioness Lansdowne.
On 18 Aug 1851 John Fitzgibbon 2nd Earl of Clare (age 59) died. His brother Richard Hobart Fitzgibbon 3rd Earl Clare (age 58) succeeded 3rd Earl Clare 3C 1795.
On 18 Aug 1852 Alexander Hamilton 10th Duke Hamilton 7th Duke Brandon (age 84) died. His son William Alexander Archibald Hamilton 11th Duke Hamilton 8th Duke Brandon (age 41) succeeded 11th Duke Hamilton, 8th Duke Brandon of Suffolk, 8th Baron Dutton of Cheshire.
On 18 Aug 1855 George Montagu 6th Duke Manchester (age 56) died. His son William Drogo Montagu 7th Duke Manchester (age 31) succeeded 7th Duke Manchester, 10th Earl Manchester, 10th Viscount Mandeville, 10th Baron Montagu of Kimbolton. Louisa Vonalten Duchess Devonshire and Manchester (age 23) by marriage Duchess Manchester.
On 18 Aug 1855 Robert Devereux 15th Viscount Hereford (age 46) died. His son Robert Devereux 16th Viscount Hereford (age 12) succeeded 16th Viscount Hereford, 13th Baronet Devereux of Castle Bromwich.
On 18 Aug 1857 Frederick Twisleton-Wykeham-Fiennes 10th or 16th Baron Saye and Sele (age 58) and Caroline Eliza Leigh Baroness Saye and Sele (age 32) were married. She by marriage Baroness Saye and Sele. The difference in their ages was 25 years. They were half first cousin once removed.
On 18 Aug 1870 Charles Douglas-Home 12th Earl of Home (age 36) and Maria Gray Countess of Home (age 21) were married. He the son of Cospatrick Alexander Douglas-Home 11th Earl of Home (age 70) and Lucy Elizabeth Montagu Scott Countess Home.
On 18 Aug 1879 James Stewart-Murray 9th Duke of Atholl was born to John Murray aka Stewart-Murray 7th Duke of Atholl (age 39).
On 18 Aug 1892 George Victor Drogo Montagu 8th Duke Manchester (age 39) died at Tandragee Castle. His son William Montagu 9th Duke Manchester (age 15) succeeded 9th Duke Manchester, 12th Earl Manchester, 12th Viscount Mandeville, 12th Baron Montagu of Kimbolton.
18 Aug 1910. Bassano Ltd. Photograph of Frances Evelyn "Daisy" Maynard Countess Warwick (age 48)
18 Aug 1910. Bassano Ltd. Photograph of Frances Evelyn "Daisy" Maynard Countess Warwick (age 48) with her daughter Mercy Greville (age 6).
Mercy Greville: On 03 Apr 1904 she was born to Francis Greville 5th Earl Warwick 5th Earl Brooke (age 51) and Frances Evelyn "Daisy" Maynard Countess Warwick (age 42). Some sources describe her father as Joseph Frederick Laycock (age 36). On 12 Nov 1968 Mercy Greville (age 64) died.
On 18 Aug 1917 Emma Harriet Wilson 12th Baroness Berners (age 81) died. Her son Raymond Robert Tyrwhitt-Wilson 13th Baron Berners (age 62) succeeded 13th Baron Berners.
On 18 Aug 1920 Edward Pelham-Clinton 10th Duke of Newcastle-under-Lyne was born to Guy Edward Pelham-Clinton.
On 18 Aug 1927 Henry Monck 5th Viscount Monck (age 78) died.
On 18 Aug 1976 Roger Grey 10th Earl Stamford 6th Earl Warrington (age 79) died at Manchester. He was buried at St Mark's Church, Dunham Massey [Map].
Earl Stamford and Baron Grey of Groby 1603 extinct.
On 18 Aug 1982 David Godfrey Bewicke-Copley 6th Baron Cromwell (age 53) died. His son Godfrey John Bewicke-Copley 7th Baron Cromwell (age 22) succeeded 7th Baron Cromwell 2C 1375.
On 18 Aug 2015 Hugh Courtenay 18th Earl of Devon (age 73) died. His son Charles Courtenay 19th Earl of Devon (age 40) succeeded 19th Earl Devon 5C 1553.
