He [William de Munchensy] married, before 1186, Aveline, daughter of Roger (DE CLARE), EARL OF HERTFORD, by Maud, daughter and heir of James DE ST. HILAIRE, of Dalling, &c., Norfolk, &c. He died before 7 May 1204. His widow married, before 29 May 1205, Geoffrey (FITZ PIERS), EARL OF Essex. She died before 4 June 1225. [Complete Peerage IX:420, (transcribed by Dave Utzinger)]