He was the uncle of King Henry VII of England and the architect of his successful conquest of England and Wales in 1485

Jasper was the second son of Owen Tudor and the former Queen Catherine of Valois, the widow of Henry V of England. He was the half-brother to Henry VI, who, on attaining his majority in 1452, named Jasper Earl of Pembroke. Through his father, Jasper was a direct descendant of Ednyfed Fychan, Llywelyn the Great's renowned Chancellor. This connection added greatly to his status in Wales.