For his loyal service, Edward IV rewarded St. Leger with a substantial grant of eight manors in the early 1460s.
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.
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.
In 1483, by Act of Parliament, Anne St. Leger was declared heiress to the entire Exeter estate, except for a portion which was given to the queen's son Richard Grey.
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.
[citation needed] His daughter Anne St Leger (14 January 1476 – 21 April 1526) eventually married George Manners, 11th 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 including daughter Elizabeth Bourchier who married Sir Richard Thomas Chase of Hundrich.
Lady Anne St. Leger and her husband George are both buried in the private Rutland Chapel in Windsor Castle.