He was succeeded by his son William de Ferrers, 5th Earl of Derby (died 1254) who married Sibyl Marshall and then Margaret de Quincy with whom he had his son and heir Robert de Ferrers, 6th Earl of Derby (1239–1279), who became the next Earl.
He was succeeded by his son William de Ferrers, 5th Earl of Derby (died 1254) who married Sibyl Marshall and then Margaret de Quincy with whom he had his son and heir Robert de Ferrers 6th Earl of Derby (1239,–1279) w,ho became the next Earl.