He [Eustace FitzJohn] married, 2ndly, Agnes, elder sister and coheir of William and daughter of William FITZNEEL, both Barons of Halton in the palatinate of Chester and Constables of Chester. Eustace died in July 1157, being slain when part of Henry II's army was ambushed in the pass of Consyllt, near Basingwerk, in North Wales. His widow married Robert FITZCOUNT, apparently an illegitimate son of an Earl of Chester. He became Constable of Chester jure uxoris and died in or before 1166. [Complete Peerage XII/2:272-4, (transcribed by Dave Utzinger)]