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-Wathiq Abū Jaʿfar Hārūn ibn Muḥammad (Arabic: أبو جعفر هارون بن محمد المعتصم‎ ‎ ; 18 April 812 – 10 August 847), better known by his regnal name al-Wāthiq Bi’llāh (الواثق بالله , "He who trusts in God"), was an Abbasid caliph who reigned from 842 until 847 AD (227–232 AH in the Islamic calendar).