Despenser's ruthless expansion of the de Clare lordship of Glamorgan in Wales led directly to the troubles of Edward II's later reign, including a rebellion in the Welsh Marches, the defeat of the Earl of Lancaster at the Battle of Boroughbridge, and eventually the deposition of the king by Roger Mortimer and Queen Isabella in 1326. Gilbert de Clare was the son of Gilbert de Clare, 7th Earl of Gloucester, -- known as Gilbert 'the Red' -- who in 1290 married Joan of Acre, daughter of Edward I. As a condition for the marriage, the earl had to surrender all his lands to the king, only to have them returned jointly to himself and his wife for the lifetime of either.
Gilbert
Edward I.