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
Black Death in England to recover, since it disproportionately affected infants and young men. This was also the case with the next occurrence, in 1369, where the death rate was around 10−15 percent. Over the following decades the plague would return on a national or a regional level at intervals of five to 12 years, with gradually dwindling death tolls. Then, in the decades from 1430 to 1480, the disease returned in force. An outbreak in 1471 took as much as 10–15 percent of the population, while the death rate of the plague of 1479–80 could have been as high as 20 percent. From