Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 39. Chapters: Byzantine Empire successor states in Anatolia, Ilkhanate, Rashidun Caliphate, Armenian Kingdom of Cilicia, Rise of the Ottoman Empire, Principality of Antioch, County of Edessa, Kingdom of Cyprus. Excerpt: The Rashidun Caliphate (Arabic: ), 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. It is also known as the Patriarchal Caliphate. Expansion of Rashidun Caliphate.After Muhammad's death in 632, the Medinan Ansar debated which of them should succeed the Prophet in running the affairs of the Muslims while the household of the Prophet was busy in his burial. Umar (who is from the Quraysh) and Abu Ubaidah ibn al-Jarrah pledged their loyalty to Abu Bakr, with the Ansar and the Quraish soon following suit. Abu Bakr thus became the first Khalifa Rasul Allah (Successor of the Messenger of God), and embarked on campaigns to propagate the Muslim Religion and Deliver the Message of God. First, though, he would have to subdue the Arabian tribes which had gone back on their oaths of allegiance to Islam and the Islamic community. As a Khalifa or Caliph he was not a monarch and never claimed such a title nor did his three successors do so. Troubles emerged soon after Abu Bakr's succession, threatening the unity and stability of the new community and state. Apostasy had actually begun in the lifetime of Muhammad, and the first major action of the apostasy was fought and satisfactorily concluded while Muhammad still lived. But the real and most serious danger of apostasy arose after Muhammad's death, when a wild wave of disbelief-after-belie...