Richard de Clare, 6th Earl of Gloucester

Richard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester, 2nd Lord of Glamorgan, 8th Lord of Clare was the son of Gilbert de Clare, 4th Earl of Hertford, and Isabel Marshal. He was also a powerful Marcher Lord in Wales and inherited the Lordship of Glamorgan upon the death of his father. He played a prominent role in the constitutional crisis of 1258–1263.