30 Dec is in December.
On 30 Dec 987 Robert "Pious" II King France (age 15) was crowned II King France: Capet.
On 30 Dec 1115 Theodoric "Valiant" Metz II Duke Lorraine (age 60) died. His son Simon Metz I Duke Lorraine (age 39) succeeded I Duke Lorraine. Adelaide Reginar Duchess Lorraine by marriage Duchess Lorraine.
On 30 Dec 1292 Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster (age 11) and Maud Chaworth (age 10) were married. He the son of Edmund "Crouchback" Plantagenet 1st Earl of Leicester 1st Earl Lancaster (age 47) and Blanche Capet Queen Navarre (age 44). He a grandson of King Henry III of England. 
On 30 Dec 1389 John Hastings 3rd Earl Pembroke (age 17) was killed in a tournament during the Christmas Court at Woodstock Palace [Map]. He was struck in the groin by the lance of Sir John Des. Earl Pembroke 4C 1339 and Baron Manny extinct.
John Hastings 6th Baron Hastings (age 61) de jure 6th Baron Hastings 1C 1290. His claim was contested by Reginald Grey 3rd Baron Grey Ruthyn (age 27) who was the son of Elizabeth Hastings Baroness Grey Ruthyn daughter of John Hastings 13th Baron Bergavenny 1st Baron Hastings his case being that he was of the full blood whereas John Hastings 6th Baron Hastings (age 61) was of the half-blood ie Reginald Grey 3rd Baron Grey Ruthyn (age 27), like John Hastings 3rd Earl Pembroke (age 17), was descended from John Hastings 13th Baron Bergavenny 1st Baron Hastings and Isabel Valence Baroness Bergavenny Baroness Hastings, whereas John Hastings 6th Baron Hastings (age 61) was descended from John Hastings 13th Baron Bergavenny 1st Baron Hastings and Isabel Despencer Baroness Hastings and Bergavenny.
After 30 Dec 1389 Richard Fitzalan 9th Earl Surrey 11th Earl Arundel (age 43) and Philippa Mortimer Countess Pembroke, Arundel and Surrey (age 14) were married. She by marriage Countess Arundel Sussex, Countess Surrey. The difference in their ages was 29 years. She the daughter of Edmund Mortimer 3rd Earl March, Earl Ulster and Philippa Plantagenet Countess March 5th Countess Ulster. He the son of Richard Fitzalan 10th Earl Arundel 8th Earl Surrey and Eleanor Plantagenet Countess Arundel and Surrey. They were first cousin twice removed. He a great x 2 grandson of King Henry III of England. She a great granddaughter of King Edward III of England. 
On 30 Dec 1436 Louis Wittelsbach III Elector Palatine (age 58) died at Heidelburg.
Chronicle of Gregory 1461. Then come tydyngys of the comynge of þea Erle of Marche (age 18) unto London; thenn alle the cytte were fayne, and thonkyd God, and sayde that
He that had Londyn for sake
Wolde no more to hem take,
and sayde, "Lette us walke in a newe wyne yerde, and lette us make us a gay gardon in the monythe of Marche with thys fayre whyte ros and herbe, the Erle of Marche (age 18)." And the Erle of Warwycke (age 32) mette with the Erle of Marche by-syde Oxforde, x myle owte of hit, at a towne of hys owne i-namyd Burford a-pon the Wolde [Map]; for the Erle of Marche come fro Walys, and was fulle sore a-ferde of the loste of the ij fyldys that were loste by-fore, Wakefylde that one, and Synt Albonys that othyr, and he sorowde sore for hys fadyr the Duke of Yorke (age 49), and for hys good brother the Erle of Rutlond (age 17), and for alle othyr lordys and comyns, &c.
Note a. the repeated in MS.
Chronicle of Gregory 1460. 30 Dec 1460. Ande the same yere, the xxx [30] day of December, the Duke of Exceter (age 30), the Duke of Somersett (age 24), the Erle of Northehomberlond (age 39), the Lorde Roos (age 33), the Lorde Nevyle (age 50), the Lorde ClyfForde (age 25), with many mo lordys, knyghtys, squyers, and gentyllys, and the commyns of the Quenys party, met with the Duke of Yorke (age 49) at Wakefylde [Map], and there they made a grete jorney a-pon the Lorde and Duke of Yorke, and toke hym and the Erle of Saulysbury (age 60), the Erle of Rutlond (age 17), and the Lorde Haryngdon (age 18), and Syr Thomas Nevyle (age 30), and Syr Thomas Haryngdon (age 60), and many mo knyghtys were take a slayne by syde alle the comyns. But thys good Duke of Yorke with hys lordys a-fore sayde loste hyr heddys; God have marcy on there soulys, for they loste in that jorneys the nombyr of xxvc [2500] men. And in the Quenys party were slay but ii c [200] men, &c.
On 30 Dec 1460 the Lancastrian army took their revenge for the defeats of the First Battle of St Albans and the Battle of Northampton during the Battle of Wakefield at Sandal Castle [Map]. The Lancastrian army was commanded by Henry Holland 3rd Duke Exeter (age 30), Henry Beaufort 2nd or 3rd Duke Somerset (age 24) and Henry Percy 3rd Earl of Northumberland (age 39), and included John Courtenay 15th Earl Devon (age 25) and William Gascoigne XIII (age 30), both knighted, and James Butler 1st Earl Wiltshire 5th Earl Ormonde (age 40), John "Butcher" Clifford 9th Baron Clifford (age 25), John Neville 1st Baron Neville of Raby (age 50), Thomas Ros 9th Baron Ros Helmsley (age 33), Henry Roos and Thomas St Leger (age 20).
The Yorkist army was heavily defeated.
Richard Plantagenet 3rd Duke York (age 49) was killed. His son King Edward IV of England (age 18) succeeded 4th Duke York 1C 1385, 7th Richard Plantagenet 3rd Duke York (age 49), 9th Earl Ulster, 3rd Earl Cambridge 3C 1414.
Thomas Neville (age 30), Thomas Harrington (age 60), and Edward Bourchier were killed.
William Bonville 6th Baron Harington (age 18) was killed. His daughter Cecily Bonville Marchioness Dorset succeeded 7th Baroness Harington.
Thomas Parr (age 53) fought in the Yorkist army.
Following the battle Richard Neville 5th Earl Salisbury (age 60) was beheaded by Thomas "Bastard of Exeter" Holland. William Bonville (age 40) was executed.
Edmund York 1st Earl of Rutland (age 17) was killed on Wakefield Bridge [Map] by John "Butcher" Clifford (age 25) by which he gained his sobriquet "Butcher". Earl of Rutland 2C 1446 extinct.
On 30 Dec 1469 George Neville 1st Baron Latimer of Snape (age 62) died at Well. He was buried at St Michaels Church, Well. His grandson Richard Neville 2nd Baron Latimer of Snape (age 1) succeeded 2nd Baron Latimer of Snape.
On 30 Dec 1494 Bishop John Russell died at Nettleham. He was buried at Lincoln Cathedral [Map].
On 30 Dec 1546 Henry VIII (age 55) made his last revision to his will signed using the Dry Stamp that was used increasingly commonly. The will confirmed the succession as King Edward VI of England and Ireland (age 9), Queen Mary I of England and Ireland (age 30) and Queen Elizabeth I of England and Ireland (age 13).
The will appointed sixteen executors: Anthony Browne (age 46), Archbishop Thomas Cranmer (age 57), Anthony Denny (age 45), John Dudley 1st Duke Northumberland (age 42), William Herbert 1st Earl Pembroke (age 45), Edward Montagu (age 61), Edward North 1st Baron North (age 50), William Paget 1st Baron Paget Beaudasert (age 40), William Paulet 1st Marquess Winchester (age 63), John Russell 1st Earl Bedford (age 61), Edward Seymour 1st Duke Somerset (age 46), Bishop Cuthbert Tunstall (age 72) and Thomas Wriothesley 1st Earl of Southampton (age 41).
Before 30 Dec 1563 Henry Tuchet 10th Baron Audley, 7th Baron Tuchet and Elizabeth Sneyd Baroness Audley Heighley were married.
On 30 Dec 1563 Henry Tuchet 10th Baron Audley, 7th Baron Tuchet died. He was buried at Betley. His son George Tuchet 1st Earl Castlehaven (age 12) succeeded 11th Baron Audley of Heighley in Staffordshire, 8th Baron Tuchet.
On 30 Dec 1577 John Hamilton 1st Marquess Hamilton (age 42) and Margaret Lyon Marchioness Hamilton were married. She by marriage Marchioness Hamilton. He the son of James Hamilton 2nd Earl Arran and Margaret Douglas Duchess Châtellerault. They were second cousins.
On 30 Dec 1595 William West 1st Baron De La Warr (age 69) died. His son Thomas West 2nd Baron De La Warr (age 39) succeeded 2nd Baron De La Warr 2C 1570. Anne Knollys Baroness De La Warr (age 40) by marriage Baroness De La Warr.
On 30 Dec 1604 George Hastings 4th Earl Huntingdon (age 64) died. His grandson Henry Hastings 5th Earl Huntingdon (age 18) succeeded 5th Earl Huntingdon 7C 1529, 10th Baron Botreaux 1368, 9th Baron Hungerford 1C 1426, 7th Baron Moleyns 1C 1445 and 7th Baron Hastings 2C 1461. Elizabeth Stanley Countess Huntingdon (age 16) by marriage Countess Huntingdon.
On 30 Dec 1623 the fourth Parliament of James I (age 57) known as the Happy Parliament was summoned.
On 19 Feb 1624 the Happy Parliament held its first session.
Roland Egerton 1st Baronet (age 29) was elected MP Wootton Bassett.
Arthur Lake (age 25) was elected MP Minehead.
James Wriothesley (age 18) was elected MP Winchester.
Richard Edgecumbe (age 53) was elected MP Grampound.
Evelyn's Diary. 30 Dec 1640. I saw his Majesty (age 40) (coming from his Northern Expedition) ride in pomp and a kind of ovation, with all the marks of a happy peace, restored to the affections of his people, being conducted through London with a most splendid cavalcade; and on the 3d of November following (a day never to be mentioned without a curse), to that long ungrateful, foolish, and fatal Parliament, the beginning of all our sorrows for twenty years after, and the period of the most happy monarch in the world: Quis talia fando!
On 30 Dec 1656 Alexander Leslie 2nd Earl Leven (age 19) and Margaret Howard Countess Leven (age 21) were married.NOTEXT
On 30 Dec 1665 Robert Cawdron died. Memorial at Church of St John the Baptist, Great Hale [Map]
On 30 Dec 1669 Christopher Monck 2nd Duke Albemarle (age 16) and Elizabeth "Mad Duchess" Cavendish Duchess Albermarle Duchess Montagu (age 15) were married at Whitehall Palace [Map]. She the daughter of Henry Cavendish 2nd Duke Newcastle upon Tyne (age 39) and Frances Pierrepont Duchess Newcastle upon Tyne (age 39). He the son of George Monck 1st Duke Albemarle (age 61) and Anne Clarges Duchess Albermarle (age 50). He a great x 4 grandson of King Edward IV of England. 
Before 30 Dec 1677 Charles North 1st Baron Grey of Rolleston 1673-5th Baron North (age 41) and Catherine Grey Baroness North and Grey of Rolleston (age 46) were married. She by marriage Baroness North, Baroness Grey of Rolleston 1673.
On 30 Dec 1687 Wriothesley Baptist Noel 2nd Earl Gainsborough (age 26) and Catherine Greville Duchess Buckingham and Normandby were married. He the son of Edward Noel 1st Earl Gainsborough (age 46) and Elizabeth Wriothesley Countess Gainsborough (age 41).
On 30 Dec 1688 Charles Cockayne 3rd Viscount Cullen (age 30) died. His son Charles Cockayne 4th Viscount Cullen (age 1) succeeded 4th Viscount Cullen.
On 30 Dec 1704 John Hay 12th Earl Erroll died. His son Charles Hay 13th Earl Erroll succeeded 13th Earl Erroll.
On 30 Dec 1715 Thomas Watson 3rd Earl Rockingham was born to Edward Watson (age 29) and Catherine Tufton (age 23).
On 30 Dec 1731 Fulbeck Hall was mostly destroyed in a fire. It was rebuilt the following year.
On 30 Dec 1776 Thomas Onslow 2nd Earl Onslow (age 22) and Arabella Mainwaring Ellerker Countess Onslow (age 21) were married. He the son of George Onslow 1st Earl Onslow (age 45) and Henrietta Shelley Countess Onslow (age 45).
On 30 Dec 1794 Archibald Kennedy 11th Earl Cassilis (age 74) died. His son Archibald Kennedy 1st Marquess of Ailsa (age 24) succeeded 12th EarL Cassilis.
On 30 Dec 1799 Thomas Grosvenor 2nd Earl Wilton was born to Robert Grosvenor 1st Marquess Westminster (age 32) and Eleanor Egerton Marchioness Westminster (age 29).
On 30 Dec 1806 Wilbraham Egerton 1st Baron Egerton Tatton was born to Wilbraham Egerton (age 25) and Elizabeth Sykes (age 29). Coefficient of inbreeding 3.12%.
On 30 Dec 1808 James Grimston 3rd Viscount Grimston (age 61) died. His son James Walter Grimston 1st Earl Verulam (age 33) succeeded 4th Viscount Grimston, 8th Baronet Grimston of Little Waltham in Essex.
On 30 Dec 1810 Archibald Seymour 13th Duke Somerset was born to Edward Seymour 11th Duke Somerset (age 35) and Charlotte Hamilton Duchess Somerset (age 38).
On 30 Dec 1815 Henry Roper-Curzon 15th Baron Teynham (age 26) and Susan Harriet Bedingfield were married.
On 30 Dec 1820 Agneta Johnson (age 80) died. Buried at St Andrew's Church, Wimpole [Map].
Inscription tablet flanked by pilasters with figures of her husband in robes of state and of two sons, and with medallion portrait at the head, all in white marble, signed 'J. FLAXMAN (age 65), R.A. Sculptor'
Agneta Johnson: On 11 Nov 1740 she was born to Henry Johnson of Berkhamstead in Hertfordshire. On 30 Dec 1762 Charles Yorke (age 40) and Agneta Johnson (age 22) were married. He the son of Philip Yorke 1st Earl of Hardwicke (age 72) and Margaret Cocks Countess Hardwicke.
On 30 Dec 1830 Elizabeth Mary Browne (age 63) died. Monument sculpted by Francis Leggatt Chantrey (age 49) in St Mary's Church Easebourne Midhurst [Map].
Elizabeth Mary Browne: On 05 Dec 1767 she was born to Anthony Joseph Browne 7th Viscount Montague (age 37) and Frances Falconer Mackworth Viscountess Montague (age 36). On 01 Sep 1794 William Stephen Poyntz (age 24) and Elizabeth Mary Browne (age 26) were married.
On 30 Dec 1831 Mary O'Brien 4th Countess Orkney (age 76) died. Her grandson Thomas Fitzmaurice 5th Earl Orkney (age 28) succeeded 5th Earl Orkney 3C 1696. Isabella Irby Countess Orkney (age 24) by marriage Countess Orkney.
On 30 Dec 1836 James Graham 3rd Duke Montrose (age 81) died. His son James Graham 4th Duke Montrose (age 37) succeeded 4th Duke Montrose. Caroline Agnes Horsley Beresford "Mr Manton" Duchess Montrose (age 18) by marriage Duchess Montrose.
On 30 Dec 1839 William Hilton (age 53) died. Monument at Lincoln Cathedral [Map].
On 30 Dec 1863 Arthur Annesley 10th Viscount Valentia (age 78) died.
On 30 Dec 1870 Charles Gordon-Lennox 8th Duke Richmond was born to Charles Gordon-Lennox 7th Duke Richmond (age 25) and Amy Mary Ricardo (age 23).
On 30 Dec 1874 James Graham 4th Duke Montrose (age 75) died. His son Douglas Beresford Malise Ronald Graham 5th Duke Montrose (age 22) succeeded 5th Duke Montrose.
On 30 Dec 1875 Maurice John George Ponsonby 4th Baron de Mauley (age 29) and Madeline Emily Augusta Hanbury-Tracy Baroness de Mauley were married.
On 30 Dec 1894 Walter Scott 8th Duke Buccleuch 10th Duke Queensberry was born to John Scott 7th Duke Buccleuch 9th Duke Queensberry (age 30) and Margaret Alice "Molly" Bridgeman Duchess Buccleuch Duchess Queensbury (age 22).
On 30 Dec 1895 Henry Rainaud Gage 6th Viscount Gage was born to Henry Charles Gage 5th Viscount Gage (age 41).
On 30 Dec 1903 Constantine Phipps 3rd Marquess Normanby (age 57) and Gertrude Stansfeld Foster Marchioness Normanby were married. She by marriage Marchioness Normanby. He the son of George Phipps 2nd Marquess Normanby and Laura Russell Marchioness Normanby. He a great x 5 grandson of King James II of England Scotland and Ireland.
On 30 Dec 1906 Angela Burdett-Coutts 1st Baroness Burdett-Coutts (age 92) died.
On 30 Dec 1915 Eleanor Thornton (age 35) drowned during the Sinking of the SS Persia.
On 30 Dec 1915 the SS Persia was torpedoed near Crete without warning by the German U-boat U-38, commanded by Max Valentiner. It sank in five to ten minutes, killing 343 of the 519 aboard.
John Douglas-Scott-Montagu 2nd Baron Montagu of Beaulieu (age 49) survived. His mistress Eleanor Thornton (age 35) drowned.
On 17 Dec 1930 William Everard Browne ffolkes 4th Baronet (age 69) died. His brother Francis Arthur Stanley ffolkes 5th Baronet (age 67) succeeded 5th Baronet ffolkes of Hillington Hall in Norfolk. On 30 Dec 1917 William Rupert Browne ffolkes was killed in action. Memorial in the Church of St Mary Hillington [Map].
William Everard Browne ffolkes 4th Baronet: In 1861 he was born to Reverend Henry Edward Browne ffolkes (age 37). On 09 May 1912 William ffolkes 3rd Baronet (age 64) died. His first cousin William Everard Browne ffolkes 4th Baronet (age 51) succeeded 4th Baronet ffolkes of Hillington Hall in Norfolk.
Francis Arthur Stanley ffolkes 5th Baronet: On 08 Dec 1863 he was born to Reverend Henry Edward Browne ffolkes (age 39). On 18 Oct 1938 or 20 Oct 1938 Francis Arthur Stanley ffolkes 5th Baronet (age 74) died. His son Edward John Patrick Boschetti ffolkes 6th Baronet (age 39) succeeded 6th Baronet ffolkes of Hillington Hall in Norfolk.
William Rupert Browne ffolkes: He was born to William Everard Browne ffolkes 4th Baronet.
On 30 Dec 1936 Henry Waldegrave 11th Earl Waldegrave (age 82) died. His son Geoffrey Waldegrave 12th Earl Waldegrave (age 31) succeeded 12th Earl Waldegrave 1C 1729, 13th Baron Waldegrave Chewton Somerset 1C 1686, 16th Baronet Waldegrave of Hever Castle.
On 30 Dec 1937 Charles Evelyn Baring 2nd Baron Howick was born to Evelyn Baring 1st Baron Howick (age 34) and Mary Cecil Grey Baroness Howick Glendale (age 30).
On 30 Dec 1952 John Michael Edward Seymour 19th Duke Somerset was born to Percy Hamilton Seymour 18th Duke Somerset (age 42) and Gwendoline Collette Jane Thomas Duchess Somerset.
On 30 Dec 2006 Antony Lambton 6th Earl of Durham (age 84) died. His son Edward Lambton 7th Earl of Durham (age 45) succeeded 7th Earl Durham.