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Half First Cousin is in Half-First Cousin Succession Heading.
After 12 Oct 633Eadfrith Deira was killed. His half first cousin Eanfrith King Bernicia (age 43) succeeded King Bernicia.
In 1184 Simon Senlis 7th Earl Huntingdon 6th Earl of Northampton (age 46) died. His half first cousin David Dunkeld 8th Earl Huntingdon (age 32) succeeded 8th Earl Huntingdon, 7th Earl of Northampton.
On 03 Jun 1253 Margaret Beaumont 7th Countess Warwick died. Her half first cousin William Maudit 8th Earl Warwick (age 33) succeeded 8th Earl Warwick. Alice Segrave Countess Warwick (age 21) by marriage Countess Warwick.
On 22 Sep 1629 Robert Radclyffe 5th Earl of Sussex (age 56) died at Clerkenwell [Map]. His first cousin once removed Edward Radclyffe 6th Earl of Sussex (age 70) succeeded 6th Earl of Sussex, 6th Viscount Fitzwalter. His half first cousin Henry Mildmay 15th Baron Fitzwalter (age 44) de jure 15th Baron Fitzwalter.
On 06 Aug 1666 William Wheler 1st Baronet (age 55) died. He was buried at All Saints Church, Derby [Map]. His half first cousin Charles Wheler 2nd Baronet (age 46) succeeded 2nd Baronet Wheler of the City of Westminster. Dorothy Bindlosse Lady Wheler (age 40) by marriage Lady Wheler of the City of Westminster.
On 21 Sep 1690 Wriothesley Baptist Noel 2nd Earl Gainsborough (age 29) died. His half first cousin Baptist Noel 3rd Earl Gainsborough (age 6) succeeded 3rd Earl Gainsborough, 6th Viscount Campden, 6th Baron Hicks of Ilmington in Warwickshire.
On 02 Jan 1741 Edward Littleton 3rd Baronet died. His half first cousin Edward Littleton 4th Baronet (age 14) succeeded 4th Baronet Littleton of Pillaton Hall.
On 16 Jun 1741 Edward Harley 2nd Earl of Oxford and Earl Mortimer (age 52) died. His half first cousin Edward Harley 3rd Earl of Oxford and Earl Mortimer (age 42) succeeded 3rd Earl of Oxford and Earl Mortimer. Martha Morgan Countess of Oxford and Mortimer (age 42) by marriage Countess of Oxford and Countess Mortimer.
On 14 Oct 1827 Frederick North 5th Earl Guildford (age 61) died. His half first cousin Francis North 6th Earl Guildford (age 54) succeeded 6th Earl Guildford, 8th Baron Guildford.
On 03 Oct 1851 Charles Jenkinson 3rd Earl Liverpool (age 67) died. Earl Liverpool and Baron Hawkesbury of Hawkesbury in Gloucestershire extinct. His half first cousin Charles Jenkinson 10th Baronet (age 72) succeeded 10th Baronet Jenkinson of Walcot in Oxfordshire and of Hawkesbury in Gloucestershire. Katherine Campbell Lady Jenkinson (age 71) by marriage Lady Jenkinson of Walcot in Oxfordshire and of Hawkesbury in Gloucestershire.
On 22 Oct 1855 William Molesworth 8th Baronet (age 45) died without issue. His half first cousin Reverend Hugh Henry Molesworth 9th Baronet (age 37) succeeded 9th Baronet Molesworth of Pencarrow in Cornwall. His will provided for his widow Andalusia Carstairs (age 45) to live at Pencarrow during her lifetime.
On 12 Apr 1929 Francis Baring 2nd Earl Northbrook (age 78) died. Earl Northbrook extinct. His half first cousin Francis Arthur Baring 4th Baron Northbrook (age 47) succeeded 4th Baron Northbrook, 6th Baronet Baring of Larkbeer in Devon.
On 17 Nov 1942 Ronald (age 25) was killed in action. He was buried at the Tabarka Ras Rajel War Cemetery, Tabarka, Jandūbah, Tunisia. His half first cousin Charles Kay-Shuttleworth 4th Baron Shuttleworth (age 25) succeeded 4th Baron Shuttleworth of Gawthorpe in Lancashire.
On 22 Feb 1963 William Grosvenor 3rd Duke Westminster (age 68) died. He was buried at St Mary's Church, Eccleston [Map]. His half first cousin Gerald Hugh Grosvenor 4th Duke Westminster (age 56) succeeded 4th Duke Westminster, 6th Marquess Westminster, 7th Earl Grosvenor, 13th Baronet Grosvenor of Eaton in Cheshire.