Richard of York, 3rd Duke of York
His conflicts with Henry's wife, Margaret of Anjou, and other members of Henry's court, as well as his competing claim to the throne, were a leading factor in the political upheaval of mid-fifteenth-century England, and a major cause of the Wars of the Roses. Richard eventually attempted to take the throne, but was dissuaded, although it was agreed that he would become king on Henry's death. But within a few weeks of securing this agreement, he died in battle. Two of his sons, Edward IV and Richard III, later ascended the throne.
Richard of York, 3rd Duke of York-2