Gilbert de Clare, 6th Earl of Hertford, 7th Earl of Gloucester, 9th Lord of Clare (2 September 1243 - 7 December 1295)
was a powerful English noble. Also known as "Red" Gilbert de Clare or "The red earl", probably because of his hair colour or fiery temper in battle. He held the Lordship of Glamorgan which was one of the most powerful and wealthy of the Welsh Marcher Lordships as well as many other English manors such as the Manor of Chilton.
