Isabel married Sir John Neville, 1st Marquess of Montagu(Yorkshire) England. John (son of Sir Richard Neville, I, Knight, 5th Earl of Salisbury and Lady Alice Montacute, 5th Countess of Salisbury) was born in ~ 1431 in Middleham Castle, Wensleydale, North Yorkshire, England; died on 14 Apr 1471 in Battle of Barnet. [Group Sheet] [Family Chart]