This type of state is not specifically European: such empires existed in Asia, Africa and the Americas. In the Muslim world, immediately after Muhammad's death in 632, Caliphates were established. Caliphates were Islamic states under the leadership of a political-religious successor to the Islamic prophet Muhammad. These polities developed into multi-ethnic trans-national empires. The Ottoman sultan, Selim I (1512–1520) reclaimed the title of caliph, which had been in dispute and asserted by a diversity of rulers and "shadow caliphs" in the centuries of the Abbasid-Mamluk Caliphate since the Mongols' sacking of Baghdad and the killing of the last Abbasid Caliph in Baghdad, Iraq 1258.