12th Earl of Oxford
They had five sons and three daughters
He was arrested with his eldest son for plotting against the King, tried for high treason, and condemned to death. John De Vere, Earl of Oxford, was beheaded on Tower Hill on 26 Feb 1462. His widow died soon after Christmas 1475 or later, apparently at Stratford Nunnery. They were buried in Austin Friars', London. [1]