Caliph n. : Successor or vicar; -- a title of the successors of Mohammed both as temporal and spiritual rulers, now used by the sultans of Turkey.

Example:
Why did Arabs attack Caliph's nation during 1st world war and break muslim union?

Taxonomy
Caliph, ruler, Caliphate, successor, authority, Umayyad, Muslims, Muhammad, dynasty, claims, Ottomans, Prophet, rightly guided caliph, Sunni, Ali, Abbasids, Shi, powers.

Defination from the web:
Caliph/Khalifah, and its historical development. ... Most historical Muslim governors were called sultans or amirs, and gave allegiance to a caliph, but at times had very little real authority. ...