Thomas St. Leger, 1st Baron St. Leger, was an English nobleman born around 1496. He served as a soldier and held various positions in the royal court during the reign of King Henry VIII. St. Leger was known for his loyalty to the crown and played a significant role in military campaigns. In 1540, he was granted the title of Baron St. Leger, which elevated his status in the peerage. He was also involved in the governance of Ireland, where he served as a member of the Irish Parliament. His contributions to both military and political affairs were notable during his lifetime.