Thomas (1358) a knight, became third Lord Fleming, Palatinate Baron of Slane. He sat in Parliament during the reign of King Richard II, being of age in 1378. He married Elizabeth Preston, daughter of Sir Robert Preston, Lord of Gormanstown by whom he had among other children, Christopher his heir and William. He died 1434 during the reign of King Henry VI; In 1407 Thomas had a pardon of intrusion into his estates without livery. That "intrusion into his estates with livery" refers to the Irish claiming English lands. The Irish were trying to establish an Irish kingdom patterned after the Kingdom of England. King Richard II, divided Irishmen into three groups: "the Wild Irish" (the enemy), the "English Rebels" and the "Obedient English". The King landed with an army in Waterford on 2 Oct 1394, and marched northward to Dublin, bolstering all his English Baronies. He also promised to pardon the English rebels of the Bronies if they would give him more allegiance. Our Baron Thomas Fleming was one of the English Barons who accepted that pardon in 1407.