Son of Sir John St Leger (1404-1445) and Margery Donnet (1408-1437). Sir Thomas St Leger (executed 13 Nov 1483) was the second husband of Anne of York (1439–1476), daughter of Richard Plantagenet, 3rd Duke of York and Cecily Neville. St. Leger faithfully served Edward IV in both a military and administrative capacity for years. Consequently, Edward IV rewarded St. Leger with a substantial grant of eight manors in the early 1460s. He was very likely was the lover of Anne of York, Duchess of Exeter before their marriage c.1474. Following his wife's death, St. Leger remained on good terms with his brother-in-law, Edward IV, and served as the king's Controller of the Mint. Not long after Edward IV's brother Richard III ascended the throne in July 1483, St Leger rebelled when the new king stripped St Leger of his offices. St Leger was ultimately captured by Richard III's forces, and executed on 13 Nov 1483 at Exeter Castle and his body interred in St. George's Chapel, Windsor, alongside that of his wife, Anne Duchess of Exeter. No mention is made of his ignominious end on the copper plate fixed to the wall of their chantry, now called the Rutland Chapel. On a shield above his head are the St. Leger arms. The Plantagenet arms appear on the shield above his wife Anne's, head and the inscription reads : Wythin thys Chappell lyethe beryed Anne Duchess of Exetur suster unto the noble kyng Edward the forte. And also the body of syr Thomas Sellynger knyght her husband whych hathe funde wythin thys College a Chauntre wyth too prestys sy'gyng for eu'more. On whose soule god haue mercy. The wych Anne duchess dyed in the yere of oure lorde M Thowsande CCCC1xxv. The photo of the tomb is that of Sir Thomas's daughter Anne by his wife Anne Duchess of Exeter, and her husband George Manners, eleventh Lord Ros and their tomb is known as the Ros tomb. The tomb clearly displays the St. Leger arms. The St. Leger Chantry was restyled the Rutland Chapel after their descendants. St Leger, described by the Crowland chronicler as a "most noble knight," was buried with his wife Anne at Windsor Castle.