- Born: Bef 1299, Ashbourne Hall, Derbyshire, England
- Marriage: Sarah de 1190,1192
- Died: 1323, Ashbourne Hall, Derbyshire, England
Noted events in his life were:
• Background Information. 1192
William Cockayne, son of Roger and Elizabeth Cockayne, married Sarah, sister of Alexander, a merchant in Ashbourne. According to a Deed, an abstract of which is given in the Harleian MSS in the British Museum, Thomas, the son of Adam, brother of Alexander, a merchant in Ashbourne, gave and confirmed to William Cockayne and Sarah his wife, (sister of the aforesaid Thomas) and to their heirs lawfully begottin in free marriage, "unam toftam," in the town of Ashbourne.
The issue of William Cockayne's marriage with Sarah, daughter of Adam, brother of Alexander, the Ashbourne merchant, were three sons, John, Robert and William.
~Cockayne Memoranda, pp. 5-6
• Background Information. 1190
Roger Cockeyn, Esq. of Ashbourne, living 1234 (son of Willliam Cockeyn, by Alice his wife, daughter of Hugh de Dalbury), by Elizabeth his wife, had two sons and three daughters. The eldest son was William Cockeyn, of Ashburne, in 1299, by Sarah, his wife, had issue, John living in Ashburne, 1305, father of John Cockayne, who by Letitia his wife, was father of another John Cockney, a person of great distinction.
~Burkes's A Genealogical History of the Dormant: Abeyant, Forfeited, and Extinct Peerages of the British Empire, p. 126
William married Sarah de, daughter of Adam and Unknown 1190.,1192 (Sarah de was born in Ashbournel, Derbyshire, England.)