Roger de Mortimer, 4th Earl of March, 6th Earl of Ulster was an English nobleman. He was considered the heir presumptive to King Richard II, his mother's first cousin, as being a great-grandson of King Edward III. Wikipedia
Born: April 11, 1374, Usk, United Kingdom
Died: July 20, 1398 (age 24 years), Kells, Ireland
Great-grandparents: Edward III, Philippa of Hainault, Edmund Mortimer, and more
Grandchildren: Richard of York, 3rd Duke of York and Isabel of Cambridge, Countess of Essex