5th Earl of Derby. Accompanied the King to France in 1230. Married c. 1219 Sibyl, 3rd daughter of William (the Marshal), Earl of Pembroke, by whom he had seven daughters, but no son. Married secondly c. 1238 Margaret, first daughter and coheir of Roger de Quincy, Earl of Winchester. Invested with the Earldom at Westmoreland, 1247.