The Expulsion of the Moriscos (Spanish: Expulsión de los moriscos) was decreed by King Philip III of Spain on April 9, 1609. The Moriscos were descendants of Spain's Muslim population who had been forced to convert to Christianity. Since the Spanish were fighting wars in the Americas, feeling threatened by the Ottomans raiding along the Spanish coast and by two Morisco revolts in the century since Islam was outlawed in Spain, it seems that the expulsions were a reaction to an internal problem of the stretched Spanish Empire. Between 1609 and 1614, the Crown systematically expelled Moriscos through a number of decrees affecting Spain's various kingdoms, with varying levels of success. Between 1492 and 1610, about three million Muslims left or were expelled from Spain.
Although initial estimates of the number expelled such as those of Henri Lapeyre range between 275,000 and 300,000 Moriscos (or 4% of the total Spanish population), the extent and actual success of the expulsion order in purging Spain of its Moriscos has been increasingly challenged by modern historians, starting with the seminal studies carried out by François Martinez (1999) and Trevor Dadson (2007). Dadson estimates that, out of a total Morisco population of 500,000, a figure accepted by many, around 5 to 10% avoided expulsion altogether and tens of thousands of those expelled managed to return.