William firstly married Lady Isabel de Longespée, daughter of
William Longespée, Earl of Salisbury and
Ela, Countess of Salisbury in 1226. They had no issue. William married secondly Lady Agnes de Ferrers, daughter of
William de Ferrers, 5th Earl of Derby, and Sibyl Marshal, they had issue; •
John de Vesci, died 1289. He married firstly Agnes of Saluzzo and secondly
Isabella de Beaumont. He had no issue. •
William de Vesci, died 1297. He inherited the great Marshal estates in
Ireland from his maternal grandmother. He married Isabella de Perinton. He had no surviving legitimate issue. •
Juliana de Vesci, she married
Richard de Vernon. Had issue. • Agnes de Vesci, she married Roger de Buckton. Had issue. • Isabel de Vesci, she married
William de Welles. Had issue. Agnes died in 1290 and was buried at the Greyfriars priory, Scarborough. ==References==