Richard of Conisburgh, 3rd Earl of Cambridge
Richard of Conisburgh, 3rd Earl of Cambridge (c.
1375 –
5 August 1415) was the younger son of
Edmund of Langley, 1st Duke of York and
Isabella of Castile, Duchess of York.
His paternal grandparents were
Edward III of England and
Philippa of Hainault. His maternal grandparents were
Pedro of Castile and
María de Padilla.
He was born at
Conisburgh Castle in
Yorkshire, and was confirmed in the
Earldom of Cambridge, which had been resigned by his brother, in
1414. In
1406, he married his cousin,
Anne Mortimer, also a grandchild of Edward III, through his son
Lionel of Antwerp. It was through her that the
Yorkist faction in the
Wars of the Roses claimed the throne. Their marriage produced a daughter,
Isabel Plantagenet, and a son,
Richard Plantagenet, 3rd Duke of York.
Following Anne's death, Cambridge married Matilda Clifford, but they were probably married a very short time before he was discovered fomenting the
Southampton Plot against
King Henry V immediately prior to departure on the French campaign. (His elder brother,
Edward of Norwich, 2nd Duke of York, would die at the
Battle of Agincourt, less than three months later.) He was stripped of all his titles and estates and was executed at
Southampton before the fleet set sail.
