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.
Umm Ruman Umm Rumān Zaynab bint ‘Āmir' ibn Uwaymir ibn Abd Shams ibn Attab Al-Kinaniyah (death 628), known by her "kunyah" "Umm Rumān" (Arabic: أمّ رومان زينب بنت عامر بن عويمر بن عبد شمس بن عتاب الكنانية‎ ‎ ) was a companion of the Islamic prophet Muhammad. She was a wife of Abu Bakr and the mother of ‘Ā’ishah, a wife of Muḥammad.