From the longer Wikipedia page 
Sir Thomas St Leger KB (c. 1440 – executed 8 November 1483) was the second son of Sir John St Leger of Ulcombe, Kent, and his wife, Margery Donnet. He was also the second husband of Anne of York, Duchess of Exeter (10 August 1439 – 14 January 1476), daughter of Richard Plantagenet, 3rd Duke of York, and Cecily Neville. His younger brother, Sir James St Leger, married Anne Butler, daughter of Thomas Butler, 7th Earl of Ormond, and was therefore an uncle to Thomas Boleyn, 1st Earl of Wiltshire.
St. Leger faithfully served Edward IV in both a military and administrative capacity for years. For his loyal service, Edward IV rewarded St. Leger with a substantial grant of eight manors in the early 1460s. He had a lucky escape from justice in 1465 when he was arrested for brawling in the Palace of Westminster and sentenced to have his hand cut off. Edward IV, however, granted him a pardon. Thomas fought for Edward at the Battle of Barnet and Battle of Tewkesbury. St Leger played a key role in ending the Hundred Years' War when he signed the Treaty of Picquigny with Louis XI on 29 August 1475. He was granted by Louis XI a pension of 12,000 crowns annually which was to be distributed between himself, Thomas Grey, 1st Marquess of Dorset, Sir John Howard (later Duke of Norfolk), Sir Thomas Montgomery, and some other of the profligate courtiers. Thomas was also knighted as a member of the Order of the Bath.
Thomas's brother-in-law, Edward IV, died suddenly on 9 April 1483, leaving behind a twelve-year-old son, Edward V, who was by marriage Thomas's nephew. However, Richard III ascended the throne in July 1483. Thomas St. Leger attended the new king’s coronation and was given cloth of silver and velvet for the occasion, but he was soon deprived of his positions of Master of Harthounds and Controller of the Mint. His daughter Anne was ordered to be handed over to Henry Stafford, 2nd Duke of Buckingham. It has been suggested that Buckingham had the heiress in mind as a bride for his own eldest son Edward. This never came to pass either, for both St. Leger and Buckingham ended up in rebellion against the new king. St Leger had been unshakably faithful to Edward IV and, like many of the other rebels of the rebellion of 1483, was undoubtedly distressed at Edward V having disappeared from sight after having been deprived of his crown.
When the rebellion floundered, St. Leger continued the fight in Exeter, but was captured. He was executed on 13 November 1483, at Exeter Castle, despite the offer of large sums of money on his behalf. He had been executed with Sir John Rame. St. Leger, described by the Crowland Chronicler as a “most noble knight,” received a private burial. They are not buried in Rutland Chapel as most believe.
His daughter Anne St Leger (14 January 1476 – 21 April 1526) eventually married George Manners, 12th Baron de Ros. Their son was Thomas Manners, 1st Earl of Rutland, and their daughter, Lady Eleanor Manners (1505 – 16 September 1548) married John Bourchier, 2nd Earl of Bath, and had descendants. Lady Anne St. Leger and her husband George are both buried in the private Rutland Chapel in Windsor Castle.