17 Apr is in April.
On 17 Apr 1080 King Harald III of Denmark (age 40) died. King Canute "The Holy" IV of Denmark (age 38) was appointed IV King Denmark.
On 17 Apr 1154 Sancho "Strong" VII King Navarre was born to Sancho "Wise" King Navarre (age 21) and Sancha Ivrea (age 15).
On 17 Apr 1199 Marie Montgomery Countess Ponthieu was born to William Montgomery IV Count Ponthieu (age 20) and Alys Capet Countess Ponthieu (age 38).
On 17 Apr 1320 Bishop Thomas Cantilupe was canonised by Pope John XII (age 76).
On 17 Apr 1331 Robert de Vere 6th Earl of Oxford (age 73) died. His nephew John de Vere 7th Earl of Oxford (age 19) succeeded 7th Earl of Oxford 2C 1141.
On 17 Apr 1427 John Valois IV Duke Brabant (age 23) died. His brother Philip Valois I Duke Brabant (age 22) succeeded I Duke Brabant.
On 17 Apr 1457 Wartislaw Griffins 9th Duke Pomerania died.
On 17 Apr 1483 the coffin of Edward IV (deceased) was carried to Westminster Abbey [Map] by Edward Stanley 1st Baron Monteagle (age 21), John Savage (age 39), Thomas Wortley (age 50), Thomas Molyneux (age 38), probably John Welles 1st Viscount Welles (age 33) who had married Edward's daughter Cecily), John Cheney 1st Baron Cheyne (age 41), Walter Hungerford (age 19), Guy Wolston (age 50), John Sapcote (age 35), Thomas Tyrrell (age 30), John Risley, Thomas Dacre 2nd Baron Dacre Gilsland (age 15), John Norreys, Louis de Bretelles and John Comyn 4th Lord Baddenoch.
Those in the procession included:
Thomas St Leger (age 43), widow of Edward's sister Anne.
William Stonor (age 33).
Henry Ferrers (age 40).
James Radclyffe (age 43).
George Browne (age 43).
Gilbert Debenham (age 51).
John Howard 1st Duke of Norfolk (age 58) walked in front of the coffin with Edward's personal arms.
John Marlow Abbot Bermondsey followed by:
Bishop Thomas Kempe (age 93).
Bishop John Hales (age 83) (Bishop of Chester?).
Bishop Robert Stillington (age 63).
Bishop William Dudley (age 58).
Cardinal John Morton (age 63) (as Bishop of Ely).
Bishop Edmund Tuchet (age 40) (as Bishop of Rochester).
Peter Courtenay Bishop of Exeter Bishop of Winchester, and.
Bishop Lionel Woodville (age 36).
Archbishop Thomas Rotherham (age 59) brought up the rear.
Cardinal Thomas Bourchier (age 65), then Archbishop of Canterbury, took no part due to infirmity.
John de la Pole 1st Earl Lincoln (age 21); the King's nephew,.
William Hastings 1st Baron Hastings (age 52).
Thomas Grey 1st Marquess Dorset (age 28).
William Herbert 2nd Earl Pembroke 1st Earl Huntingdon (age 32) (some sources say Earl of Huntingindon?).
William Berkeley 1st Marquess Berkeley (age 57).
Thomas Stanley 1st Earl of Derby (age 48).
Richard Fiennes 7th Baron Dacre Gilsland (age 68).
John Dudley 1st Baron Dudley (age 82).
George Neville 4th and 2nd Baron Bergavenny (age 43).
John Tuchet 6th Baron Audley, 3rd Baron Tuchet (age 57).
Walter Devereux Baron Ferrers of Chartley (age 51).
Edward Grey 1st Viscount Lisle (age 51).
Henry Lovell 9th Baron Marshal 8th Baron Morley (age 7).
Richard Woodville 3rd Earl Rivers (age 30).
John Brooke 7th Baron Cobham (age 35).
Richard Hastings Baron Willoughby (age 50).
On 17 Apr 1524 Edward Stanley 1st Baron Monteagle (age 62) died at Hornby Castle [Map]. His son Thomas Stanley 2nd Baron Monteagle (age 16) succeeded 2nd Baron Monteagle.
On 17 Apr 1543 William Parr 1st Marquess Northampton (age 31) and Anne Bourchier 7th Baroness Bourchier (age 26) were divorced by an Act of Parliament and their children declared illegitimate.
On 17 Apr 1573 Maximilian "The Great" Wittelsbach I Duke Bavaria I Elector Bavaria was born to William Wittelsbach V Duke Bavaria (age 24) and Renata Lorraine Duchess Bavaria (age 28) at Munich. Coefficient of inbreeding 2.86%. 
On 17 Apr 1581 Humphrey Bradbourne (age 57) died. Monument in St Oswald's Church, Ashbourne [Map]. Around the sides of the tomb their six sons and four daughters. The tomb sculpted by Richard and Gabriel Royley of Burton upon Trent. Chest with Weepers holding Shields. Dress Folds at Feet. Ruffs.
Humphrey Bradbourne: Around 1524 he was born to John Bradbourne (age 35) and Isabel Cotton (age 31). Date adjusted from 1537 to be consistent with father's death.
On 17 Apr 1617 John Carey 3rd Baron Hunsdon (age 67) died at Hunsdon [Map]. His son Henry Carey 1st Earl Dover (age 37) succeeded 4th Baron Hunsdon 1C 1559. Judith Pelham Countess Dover (age 26) by marriage Baroness Hunsdon.
Before 17 Apr 1648 George Booth 1st Baron Delamer (age 25) and Elizabeth Grey Baroness Delamer (age 26) were married. She the daughter of Henry Grey 1st Earl Stamford (age 49) and Anne Cecil Countess Stamford (age 52).
On 17 Apr 1652 Henry Howard 22nd Earl Arundel 5th Earl Surrey 2nd Earl Norfolk (age 43) died. His son Thomas Howard 5th Duke of Norfolk (age 25) succeeded 23rd Earl Arundel Sussex, 6th Earl Surrey 3C 1483, 3rd Earl Norfolk 5C 1644, 13th Baron Maltravers 1C 1330, 13th Baron Arundel 1C 1377, 16th Baron Mowbray 1C 1129, 17th Baron Segrave 1C 1283.NOTEXT
On 17 Apr 1694 Charles Beauclerk 1st Duke St Albans (age 23) and Diana Vere Duchess St Albans (age 15) were married. She by marriage Duchess St Albans. She the daughter of Aubrey de Vere 20th Earl of Oxford (age 67) and Diana Kirke Countess of Oxford. He the son of King Charles II of England Scotland and Ireland and Nell Gwyn.
On 17 Apr 1699 Laurence Barry 3rd Earl Barrymore (age 35) died. His brother James Barry 4th Earl Barrymore (age 32) succeeded 4th Earl Barrymore.
On 17 Apr 1714 Baptist Noel 3rd Earl Gainsborough (age 30) died of smallpox. His son Baptist Noel 4th Earl Gainsborough (age 6) succeeded 4th Earl Gainsborough 1C 1682, 7th Viscount Campden.
On 17 Apr 1720 James Drummond 2nd Duke Perth (age 46) died. His son James Drummond 3rd Duke Perth (age 6) succeeded 3rd Duke Perth.
On 17 Apr 1734 William Sutherland 17th Earl Sutherland (age 25) and Elizabeth Wemyss Countess Sutherland were married. She the daughter of David Wemyss 4th Earl Wemyss and Elizabeth St Clair. They were half second cousin once removed.
On 17 Apr 1751 Henry Petty 1st Earl Shelburne (age 75) died. Earl Shelburne in County Wexford 1C 1719, Baron Shelburne 3C 1699 extinct. His estates were inherited by his nephew John Petty-Fitzmaurice 1st Earl Shelburne (age 45) who changed his surname to Petty-Fitzmaurice.
On 17 Apr 1773 Arthur Saunders Gore 1st Earl Arran (age 70) died. His son Arthur Saunders Gore 2nd Earl Arran (age 38) succeeded 2nd Earl Arran 3C 1762, 2nd Viscount Sudley of Castle Gore in County Mayo, 2nd Baron Saunders of Deeps in County Wexford. Anne Knight Countess of Arran by marriage Countess Arran.
On 19 Feb 1780 Samuel Egerton (deceased) was buried at St Mary's Church, Rostherne [Map]. Sculpted by John "The Elder" Bacon (age 39). Figures representing Hope and Patience
The monument inscription describes those also buried in the vault: John Egerton, his wife Elizabeth Barbour buried 10 Feb 1743, her mother Elizabeth Hill (age 55) buried 17 Apr 1713 and John and Elizabeth's daughter-in-law Beatrix Copley (age 34) buried 01 May 1755.
On 17 Apr 1782 Frederick Lamb 3rd Viscount Melbourne was born to Penistone Lamb 1st Viscount Melbourne (age 37) and Elizabeth Milbanke Viscountess Melbourne (age 30). His paternity is considered a matter of conjecture given that his mother is believed to have had numerous lovers?
On 17 Apr 1791 James Brownlow William Gascoyne-Cecil 2nd Marquess Salisbury was born to James Cecil 1st Marquess Salisbury (age 42) and Mary Amelia Hill Marchioness Salisbury (age 40).
On 17 Apr 1795 Charles Cornwallis 2nd Marquess Cornwallis (age 20) and Louisa Gordon Marchioness Cornwallis (age 18) were married. She the daughter of Alexander Gordon 4th Duke Gordon (age 51) and Jane Maxwell Duchess Gordon (age 47). He the son of Charles Cornwallis 1st Marquess Cornwallis (age 56) and Jemima Tullekin Jones Marchioness Cornwallis.
On 17 Apr 1799 Robert King 2nd Earl Kingston (age 45) died. His son George King 3rd Earl Kingston (age 28) succeeded 3rd Earl Kingston. Helena Moore (age 25) by marriage Countess Kingston.
On 17 Apr 1806 Robert Herbert Butler 3rd Earl Lanesborough (age 46) died. His son Brinsley Butler 4th Earl of Lanesborough (age 22) succeeded 4th Earl Lanesborough.
On 17 Apr 1811 Alexander Duff 3rd Earl Fife (age 79) died. His son James Duff 4th Earl Fife (age 34) succeeded 4th Earl Fife. Maria Caroline Manners Countess Fife by marriage Countess Fife.
On 17 Apr 1815 Thomas Noel 2nd Viscount Wentworth (age 69) died without legitmate issue. Viscount Wentworth 2C 1762, Baronet Noel extinct. Baron Wentworth 1C 1529 abeyant. His sister Judith Noel (age 64) inherited his estates at which time her husband Ralph Milbanke aka Noel 6th Baronet (age 67) changed his name from Milbanke to Noel by Royal Licence.
On 17 Apr 1855 William Fitzclarence 2nd Earl Munster (age 30) and Wilhelmina Kennedy-Erskine (age 24) were married. He the son of George Fitzclarence 1st Earl Munster and Mary Wyndham Countess Munster. They were first cousins. He a grandson of King William IV of the United Kingdom. She a granddaughter of King William IV of the United Kingdom. 
On 17 Apr 1864 Admiral Edward Fitzherbert 13th Baron Stafford was born to Basil Thomas Fitzherbert (age 28) and Emily Charlotte Stafford-Jerningham (age 29).
In 17 Apr 1868 Margaret Green (age 84) died. Monument at St Mary's Church, Buckden [Map].
Margaret Green: Around 1784 she was born. In 1826 Bishop Edward Maltby (age 55) and Margaret Green (age 42) were married.
On 17 Apr 1874 William Lever 1st Viscount Leverhulme (age 22) and Elizabeth Ellen Hulme Viscountess Leverhulme (age 23) were married.
On 17 Apr 1880 George Manners Astley 20th Baron Hastings (age 23) and Elizabeth Evelyn Harbord Baroness Hastings (age 20) were married at the Chapel Royal, Whitehall Palace. She by marriage Baroness Hastings.
On 17 Apr 1880 Alan Ian Percy 8th Duke Northumberland was born to Henry George Percy 7th Duke Northumberland (age 33) and Edith Campbell Duchess Northumberland (age 30).
On 17 Apr 1880 James Grimston 4th Earl of Verulam was born to James Walter Grimston 3rd Earl Verulam (age 27) and Margaret Francis Graham Countess Verulam (age 26).
On 17 Apr 1890 Charles Hardinge 1st Baron Penshurt (age 31) and Winifred Selina Sturt (age 22) were married. They were first cousins.
On 17 Apr 1892 Archibald Montagu Stuart-Wortley-Mackenzie 3rd Earl of Wharncliffe was born to Francis Montagu Stuart-Wortley-Mackenzie 2nd Earl of Wharncliffe (age 35).
On 17 Apr 1894 Charles James Stanley Howard 10th Earl Carlisle (age 27) and Rhona Ankaret Estrange Countess Carlisle (age 26) were married. He the son of George Howard 9th Earl Carlisle (age 50) and Rosalind Frances Stanley Countess Carlisle (age 49).NOTEXT
On 17 Apr 1912 William Feilding 10th Earl of Denbigh was born to Rudolph Feilding Viscount Feilding (age 26).
On 17 Apr 1913 John Patrick Riversdale Glyn 6th Baron Wolverton was born to Maurice George Carr Glyn (age 41) and Maud Grosvenor (age 38).
On 17 Apr 1920 Roger Edward Lloyd-Mostyn 5th Baron Mostyn was born to Edward Llewelyn Roger Lloyd-Mostyn 4th Baron Mostyn (age 35).
On 17 Apr 1926 Charles William Noel 3rd Earl Gainsborough (age 75) died. His son Arthur Noel 4th Earl of Gainsborough (age 41) succeeded 4th Earl Gainsborough 2C 1841, 6th Baron Barham. Alice Mary Eyre Countess Gainsborough by marriage Countess Gainsborough.
On 17 Apr 1936 Frederick Smith 3rd Earl of Birkenhead was born to Frederick Smith 2nd Earl of Birkenhead (age 28).
On 17 Apr 1937 Hugo Denison 4th Earl of Londesborough (age 42) died. He was buried at St Oswald's Church, Blankney. The Earl had become ill and it was decided to to move him to London for treatment; he died on the journey. Earl Londesborough in Yorkshire extinct. The impact of death duties necessitated the sale of Blankney, Lincolnshire to Mr William Parker of Norfolk. The Countess, Marigold Lubbock Countess Londesborough (age 33), and her daughter Zinnia Rosemary Denison, continued to live on the estate.
Marigold Lubbock Countess Londesborough: On 15 May 1903 she was born to Edgar Lubbock (age 56). On 07 Sep 1935 Hugo Denison 4th Earl of Londesborough (age 40) and Marigold Lubbock Countess Londesborough (age 32) were married at St Oswald's Church, Blankney. He the son of William Henry Francis Denison 2nd Earl Londesborough and Grace Adelaide Fane Countess Londesborough.
Zinnia Rosemary Denison: On 25 Nov 1937 she was born to Hugo Denison 4th Earl of Londesborough and Marigold Lubbock Countess Londesborough (age 34). She was born posthumously her father having died six months before her birth. On 13 Jul 1997 Zinnia Rosemary Denison (age 59) died.
On 17 Apr 1953 Edward Stourton 24th Baron Stourton, 26th Baron Segrave, 25th Baron Mowbray was born to Charles Stourton 23rd Baron Stourton 25th Baron Segrave 24th Baron Mowbray (age 30).
On 17 Apr 1968 Ivo Bligh 12th Earl of Darnley was born to Adam Ivo Stuart Bligh 11th Earl of Darnley (age 26).
