The leader of a caliphate is called the caliph, meaning deputy or representative. All caliphs are believed to be the successor to Prophet Muhammad. Muhammad was not a caliph; according to the Quran he was the last and greatest of the prophets. That means no one can replace Muhammad as the messenger of God.

Who is caliph in Islam today?

The 5th and current Caliph of the Messiah of the Ahmadiyya Community is Mirza Masroor Ahmad.

What were the two main objective of caliphate?

The twin objectives of the caliphate were to retain control over the tribes constituting the umma and to raise resources for the state. Following Muhammad's death, many tribes broke away from the Islamic state. Some even raised their own prophets to establish communities modelled on the umma.