The imposture of a cloth trader from Flanders, who claimed to be Richard Duke of York (One of Edward IV's sons, and one of the two who were 'murdered' in the ToL)
1491
Warbeck began to impersonate Richard Duke of York in Ireland
1492
He fled to the court of Margaret of Burgundy, was trained as a potential yorkist prince, and began to draw English courtiers into conspiracys.
1495
He attempted to land in England in 1495, but was quickly defeated; he fled to the court of James IV of Scotland
1496
He tried to invade England with a small Scottish force; this soon retreated, and James IV agreed to marry Henry VII's daughter, Margaret
1497
He tried to claim the throne by exploiting the Cornish Rebellion; his forces were crushed; Warbeck surrendered; he was treated leniently at first but tried to escape.
1499
He was tried and executed along with the Earl of Warwick
significance:
Patronage from foreign rulers made Warbeck a potentially serious threat and demonstrated how fragile Henry's position was considered to be by other rulers
The involvement (in 1495) in the conspiracy of Sir William Stanley showed how vulnerable Henry was even within his own household.