Who were the Yorkist imposters who challenged Henry VII's rule?

Answer 1

Lambert Simnel, posing as the Earl of Warwick, whom Henry VII had already imprisoned in the Tower of London, under the control of a number of Yorkist nobles including George, Duke of Clarence's eldest son, John de la Pole in 1487 was given 2000 German mercenaries by Margaret of Burgundy, Richard III's sister. He was defeated in battle at Stoke. Perkin Warbeck impersonated the youngest of Edward IV's sons, Richard, Duke of York. He was never as successful in his rebellion as Simnel was as by the time he stood against the Crown in 1491, Henry VII's foreign policy had improved somewhat and Warbeck was denied sanctuary in many countries such as Scotland, France and Spain. In 1497, Warbeck attempted to stir up rebellion in Cornwall but was crushed by Henry's army. He was taken to the Tower and later executed in 1499. Edmund de la Pole, brother to John who helped Simnel and was killed at the Battle of Stoke, calling himself the "White Rose" fled England for Burgundy after the deaths of Henry VII's wife and eldest son. In the Treaty of Windsor in 1506, Henry VII made an deal with King Philip and Queen Joanna of Burgundy in which they agreed to send Edmund back to England in return for his help in their taking of the throne of Castille.