William Leask of that Ilk1
Child of William Leask of that Ilk
- William Leask of that Ilk+2 d. b 9 Oct 1388
William Leask of that Ilk1 
Children of William Leask of that Ilk and Mariota de St. Michael
Child of William Leask of that Ilk and Alice de Rath
- Thomas Leask of that Ilk+2 d. bt 28 Aug 1392 – 5 Oct 1436
Alice de Rath1 
Her married name became Leask.
Child of Alice de Rath and William Leask of that Ilk
- Thomas Leask of that Ilk+2 d. bt 28 Aug 1392 – 5 Oct 1436
Thomas Leask of that Ilk1 
On 23 April 1391 a witness at Kirkwall, Orkney.1
Children of Thomas Leask of that Ilk
- Humphrey Leask of that Ilk+2 d. b 14 Jul 1483
- James Leask+2
Humphrey Leask of that Ilk1 
He was living in 1435.1 On 4 November 1456 he resigned Leask for regrant by 1st Earl of Erroll.1
Child of Humphrey Leask of that Ilk
- Thomas Leask of that Ilk+2 d. bt 14 Jul 1483 – 4 Aug 1484
James Leask1
Laird of Hupe (Hope), Stronsay, Orkney.1 He lived at Cragy, Scotland.1 He was living between 1422 and 1426.1
Children of James Leask and Margaret Sinclair
Victoria Mary Louisa Cust1 
From 6 August 1846, her married name became Yorke.1
Children of Victoria Mary Louisa Cust and Simon Yorke
- Philip Yorke+3 b. 1849, d. 1922
- Victor Yorke3 b. 1857, d. 1881
- [S40] L. G. Pine, editor, Burke’s Genealogical and Heraldic History of the Landed Gentry, 17th edition, (London, England: Burke’s Peerage Ltd, 1952), page 2821. Hereinafter cited as Burke’s Landed Gentry, 17th ed.
- [S7280] Jill Burton, “re: Cust Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 September 2014. Hereinafter cited as “re: Cust Family.”
- [S9541] Jill Burton, “re: Yorke Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 7 Feb 2022. Hereinafter cited as “re: Yorke Family.”
Margaret Sinclair1
Her married name became Leask.
Children of Margaret Sinclair and James Leask
William Leask1
Between 1460 and 1470 (an unknown value.)1
Children of William Leask and Janet Harraldsone
