He [Roger de Somery] married Agnes (d), who survived him, and died on or before 23 November 1308. He died on or before 11 October 1291. [Complete Peerage XII/1:114, (transcribed by Dave Utzinger)]
(d) She held in Sulham and Basildon, Berks, but her parentage has not been traced. On 8 Feb 1307/8 she was summoned to attend the Coronation in the train of the King and Queen.