The Rashidun Caliphate (Arabic: ??????? ????????? al-khilafat ar-R?shid?yah), comprising the first four caliphs in Islam's history, was founded after Muhammad's death in 632, Year 10 A.H.. At its height, the Caliphate extended from the Arabian Peninsula, to the Levant, Caucasus and North Africa in the west, to the Iranian highlands and Central Asia in the east. It was the largest empire in history up until that time.[1] It is also known as the Patriarchal Caliphate.