A person considered a religious successor to the Islamic prophet Muhammad (Muhammad ibn ʿAbdullāh) and a leader of the entire Muslim community would have used what financial institution?
Caliphate A caliphate (Arabic: خِلافة‎ ‎ "khilāfa") is a territory under the leadership of an Islamic steward known as a caliph ( , Arabic: خَليفة‎ ‎ "khalīfah ",    ), a person considered a religious successor to the Islamic prophet Muhammad (Muhammad ibn ʿAbdullāh) and a leader of the entire Muslim community. Historically, the caliphates were polities based in Islam which developed into multi-ethnic trans-national empires. During the medieval period, three major caliphates existed: the Rashidun Caliphate (632–661), the Umayyad Caliphate (661–750) and the Abbasid Caliphate (750–1258). The fourth major caliphate, the Ottoman Caliphate, established by the Ottoman Empire in 1517, was a manifestation whereby the Ottoman rulers claimed caliphal authority. During the history of Islam, several other Muslim states, almost all of them hereditary monarchies, have claimed to be caliphates.
Al-Qa'im bi-Amr Allah Abu'l-Qasim Muhammad ibn al-Mahdi (Arabic: أبو القاسم محمد بن المهدي القائم بأمر الله‎ ‎ ; April 893 – 17 May 946), better known by his regnal name al-Qa'im bi-Amr Allah or bi-Amri 'llah (القائم بأمر الله , "He who carries out God's orders"), was the second caliph of the Fatimid Caliphate in Ifriqiya and ruled from 934 to 946. He is the 12th Imam according to the Isma'ili faith.