ケンブリッジ伯
Mortimer had no issue, and at his death the Mortimer line of the Earls of March became extinct. The heir to his estates and titles was the son of his sister Anne and the Earl of Cambridge, Richard of York, 3rd Duke of York (1411–1460). Richard also inherited Mortimer's claim to the throne, which he eventually raised, causing the Wars of the Roses.