His conflicts with Henry's wife, Margaret of Anjou, and other members of Henry's court, as well as his competing claim on 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.
Konfliknya dengan istri Henry, Margaret of Anjou, dan para anggota pemerintahan Henry lainnya, serta perebutan klaimnya terhadap tahta, menjadi faktor utama dalam kebangkitan politik di Inggris pada pertengahan abad kelima belas, dan sebab besar dari Peperangan Mawar.