In 1452, during the preparation stages of the final Ottoman siege of Constantinople, Constantine XI sent an urgent message to the Morea, requesting that one of his brothers bring their forces to help him defend the city. To prevent aid coming from the Morea, Mehmed II sent one of his generals, Turahan Bey (who had raided the Morea twice before) to devastate the peninsula. The Turkish attack was repelled by an army commanded by Matthew Palaiologos Asen, but this victory came too late to offer any aid to Constantinople, which fell on 29 May 1453.