Reginald was a feudal chief of great rank in the reign of Henry III. This feudal lord had summons to march against the Welsh in the 42nd of Henry III (1258), and in two years afterwards received orders, as one of the barons marchers, to reside in those parts. In 1261 he was made Sheriff of Hampshire and Governor of the Castle of Winchester; and in 1264 he was one of those barons who undertook for the King's performance, regarding the ordinances of Oxford. He married Joane, daughter of William de Fortibus de Vivonia, Lord of Chewton or Chuton in County Somerset. He died in 1285 and was succeeded by his son, Peter FitzReginald.