The first Islamic state was established by the Islamic prophet Muhammad in the city of Medina in 622, under the Constitution of Medina. It represented the political unity of the Muslim Ummah (nation). After Muhammad's death, his companions known as the Rightly Guided Caliphs (Rashidun) founded the Rashidun Caliphate (632–661), which began massive expansion and motivated subsequent Islamic states, such as the Umayyad Caliphate (661–750) and Abbasid Caliphate (750–1258).