John Horace Round, 1911 Encyclopædia Britannica, Volume 6… (1911)
“ He was constantly fighting the Welsh for his family possessions in Wales and quarrelled with Becket over Tunbridge Castle. In 1173 or 1174 he was succeeded by his son Richard as third earl, whose marriage with Amicia, daughter and co-heir of William, earl of Gloucester, was destined to raise the fortunes of his house to their highest point. He and his son Gilbert were among the “barons of the Charter,” Gilbert, who became fourth earl in 1217, obtained also, early in 1218, the earldom of Gloucester, with its great territorial “Honour,” and the lordship of Glamorgan, in right of his mother ”
