Wars of the Roses the Hundred Years' War, unfolding the structural problems of feudalism, combined with the mental infirmity and weak rule of King Henry VI which revived interest in Richard of York's claim to the throne. Historians disagree on which of these factors to identify as the main reason for the wars. With the Duke of York's death, the claim transferred to his heir, Edward, who later became the first Yorkist king of England, as Edward IV. He reigned from 1461, interrupted by a Lancastrian uprising and reinstallment of Henry VI in 1470 to 1471, until his sudden death in 1483. His son
Johann Heynlin Sallust (1470-1471), the third the "Orationes" of Bessarion (1471), and the fourth was Fichet's own "Rhetorica" in 1471. The number of the works which they published from 1470 to 1472 amounts to some thirty works. At the end of 1472 or at the beginning of 1473, Heynlin and Fichet left the Sorbonne to settle on Rue Saint-Jacques. Two of their apprentices, Pierre de Kaysere (Petrus Caesaris) and Jean Stoll, established around the same time and on the same street their own competing printing press, with the emblem of the "Soufflet-Vert". The German humanist Johann Reuchlin attached himself to Heynlin, whom