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
Facetiae (a quarto with 110 leaves). The second oldest is called Reichling 1919 (100 leaves). The 100-leaf edition, despite having been described elsewhere as the first printing, is now generally held to be later than the 110-leaf edition, which is traditionally thought to be the editio princeps; both were printed in Rome in 1470/1471. An edition from 1473–1476, Hain 13182, was printed somewhere in Poland. Christophorus Valdarfer in Venice likewise printed an edition (with 76 leaves) in 1470/1471, and Andreas Belfortis in Ferrara printed one dated 1471. According to Lotte Hellinga, the Venice edition by Valdarfer is probably older than Lauer's