Caliph in the context of Al-Wathiq

Selim I (Ottoman Turkish: سليم الأول; Turkish: I. Selim; 10 October 1470 – 22 September 1520), also known as Selim the Grim or Selim the Resolute (Turkish: Yavuz Sultan Selim), was the sultan of the Ottoman Empire from 1512 to 1520. Despite lasting only eight years, his reign is notable for the enormous expansion of the Empire, particularly his conquest between 1516 and 1517 of the entire Mamluk Sultanate of Egypt, which included all of the Levant, Hejaz, Tihamah and Egypt itself. On the eve of his death in 1520, the Ottoman Empire spanned about 3.4 million km (1.3 million sq mi), having grown by seventy percent during Selim's reign.

Selim's conquest of the Middle Eastern heartlands of the Muslim world, and particularly his assumption of the role of guardian of the pilgrimage routes to Mecca and Medina, established the Ottoman Empire as the pre-eminent Muslim state. His conquests dramatically shifted the empire's geographical and cultural center of gravity away from the Balkans and toward the Middle East. By the eighteenth century, Selim's conquest of the Mamluk Sultanate had come to be romanticized as the moment when the Ottomans seized leadership over the rest of the Muslim world, and consequently Selim is popularly remembered as the first legitimate Ottoman Caliph, although stories of an official transfer of the caliphal office from the Mamluk Abbasid dynasty to the Ottomans were a later invention.

The following is a list of Muslim historians writing in the Islamic historiographical tradition, which developed from hadith literature in the time of the first caliphs.

Sunni Islam is the largest branch of Islam and the largest religious denomination in the world. It holds that Muhammad did not appoint any successor and that his closest companion Abu Bakr (r. 632–634) rightfully succeeded him as the caliph of the Muslim community, being appointed at the meeting of Saqifa. This contrasts with the Shia view, which holds that Muhammad appointed Ali ibn Abi Talib (r. 656–661) as his successor. Nevertheless, Sunnis revere Ali, along with Abu Bakr, Umar (r. 634–644) and Uthman (r. 644–656) as 'rightly-guided caliphs'.

The term Sunni means those who observe the sunna, the practices of Muhammad. The Quran, together with hadith (especially the Six Books) and ijma (scholarly consensus), form the basis of all traditional jurisprudence within Sunni Islam. Sharia legal rulings are derived from these basic sources, in conjunction with consideration of public welfare and juristic discretion, using the principles of jurisprudence developed by the four legal schools: Hanafi, Hanbali, Maliki and Shafi'i.

The Rashidun Caliphate (Arabic: ٱلْخِلَافَةُ ٱلرَّاشِدَةُ, romanized: al-Khilāfah ar-Rāšidah) is the early Islamic polity led by the first four successive caliphs (lit. "successors") Abu Bakr, Umar, Uthman and Ali, collectively the Rashidun, or "Rightly Guided" caliphs. These early caliphs led the Muslim community from the death of the Islamic prophet Muhammad in 632 CE to the foundation of the Umayyad Caliphate in 661 CE.

The title Rashidun stems from the Sunni Islamic belief that the caliphs were "rightly guided". Endowed with superior piety and wisdom, their era is regarded in Sunni Islam as a "golden age", second only to the lifetime of the Prophet Muhammad in sanctity and in providing moral and religious guidance. Sunni Muslims consider the "rightly guided" reign of the first four caliphs as a model to be followed and emulated from a religious point of view. The term Rashidun is not used by Shia Muslims, who make up 10–15% of the global Muslim population, as they reject the rule of the first three caliphs as illegitimate.

The Almohad Caliphate or Almohad Empire was a North African Berber Muslim empire founded in the 12th century. At its height, it controlled much of the Iberian Peninsula (Al-Andalus) and North Africa (the Maghreb).

The Almohad movement was founded by Ibn Tumart among the Berber Masmuda tribes, but the Almohad caliphate and its ruling dynasty, known as the Mu'minid dynasty, were founded after his death by Abd al-Mu'min. Around 1121, Ibn Tumart was recognized by his followers as the Mahdi, and shortly afterwards he established his base at Tinmel in the Atlas Mountains. Under Abd al-Mu'min (r. 1130–1163), they succeeded in overthrowing the ruling Almoravid dynasty governing the western Maghreb in 1147, when he conquered Marrakesh and declared himself caliph. They then extended their power over all of the Maghreb by 1159. Al-Andalus followed, and all of Muslim Iberia was under Almohad rule by 1172.

Abd Allah ibn Abi Quhafa (Arabic: عَبْدُ اللهِ بْنُ أَبِي قُحَافَةَ, romanized: ʿAbd Allāh ibn ʾAbī Quḥāfa) (c. 573 – 23 August 634), better known by his kunya Abu Bakr, was a senior companion, the closest friend, and father-in-law of Muhammad, the Islamic prophet. He served as the first caliph of the Rashidun Caliphate, ruling from 632 until his death in 634. Abu Bakr was granted the honorific title al-Ṣiddīq (lit. the Veracious) by Muhammad, a designation that continues to be used by Sunni Muslims to this day.

Born to Abu Quhafa and Umm al-Khayr of the Banu Taym, Abu Bakr was among the earliest converts to Islam and propagated dawah to the Mushrikites. He was considered the first Muslim missionary, as several companions of Muhammad converted through Abu Bakr. He accompanied Muhammad on his migration to Medina and became one of his bodyguards. Abu Bakr participated in all of Muhammad's campaigns and served as the first amir al-hajj in 631. In the absence of Muhammad, Abu Bakr led the prayers.

Shia Islam is the second-largest branch of Islam. It holds that Muhammad designated Ali ibn Abi Talib (r. 656–661) as both his political successor (caliph) and as the spiritual leader of the Muslim community (imam). However, his right is understood to have been usurped by a number of Muhammad's companions at the meeting of Saqifa, during which they appointed Abu Bakr (r. 632–634) as caliph instead. As such, Sunni Muslims believe Abu Bakr, Umar (r. 634–644), Uthman (r. 644–656) and Ali to be 'rightly-guided caliphs', whereas Shia Muslims regard only Ali as the legitimate successor.

Shia Muslims believe that the imamate continued through Ali's sons, Hasan and Husayn, after which various Shia branches developed and recognized different imams. They revere the ahl al-bayt, the family of Muhammad, maintaining that they possess divine knowledge. Shia holy sites include the shrine of Ali in Najaf, the shrine of Husayn in Karbala, and other mausoleums of the ahl al-bayt. Later events, such as Husayn's martyrdom in the Battle of Karbala (680 CE), further influenced the development of Shia Islam, contributing to the formation of a distinct religious sect with its own rituals and shared collective memory.

Uthman ibn Affan (Arabic: عُثْمَان بْن عَفَّان, romanized: ʿUthmān ibn ʿAffān) (c. 573 or 576 – 17 June 656) was the third caliph of the Rashidun Caliphate, ruling from 644 until his assassination in 656. Uthman, a second cousin, son-in-law, and senior companion of the Islamic prophet Muhammad, played a major role in early Islamic history. During his reign as caliph, he was known for ordering the official compilation of the standardized version of the Quran, known as Uthman's Quran, that is still being used today.

Before his predecessor, caliph Umar (r. 634–644) died in office, he appointed a committee of trustees to elect a successor. Uthman, who was then aged 68–71 years, was elected to succeed him and became the oldest person to hold such a high position. During his premiership, the Caliphate expanded further into Persia and reached as far as the provinces of Khorasan and Transoxiana in the East as well as Ifriqiya and the Iberian Peninsula in the West. Uthman instituted centralized reforms in order to create a more cohesive administrative structure and fostered rapid economic growth.

Mu'tazilism (Arabic: المعتزلة, romanized: al-muʿtazila, singular Arabic: معتزلي, romanized: muʿtazilī) is an Islamic theological school that appeared in early Islamic history and flourished in Basra and Baghdad. Its adherents, the Mu'tazilites, were known for their neutrality in the dispute between Ali and his opponents such as Mu'awiya after the death of the third caliph, Uthman. By the 10th century the term al-muʿtazilah had come to refer to a distinctive Islamic school of speculative theology (kalām). This school of theology was founded by Wasil ibn Ata.

The later Mu'tazila school developed an Islamic type of rationalism, based around fundamental principles: the oneness (Tawhid) and justice (Al-'adl) of God, human freedom of action, and the creation of the Quran. The Mu'tazilites are best known for rejecting the doctrine of the Quran as uncreated and co-eternal with God, asserting that if the Quran is the literal word of God, he logically "must have preceded his own speech". This went against a common Sunni position (followed by the Ashʿarī and Māturīdī) which argued that with God being all-knowing, his knowledge of the Quran must have been eternal, hence uncreated just like him. The school also worked to resolve the theological "problem of evil", arguing that since God is just and wise, he cannot command what is contrary to reason or act with disregard for the welfare of His creatures; consequently evil must be regarded as something that stems from errors in human acts, arising from man's divinely bestowed free will.The Mu'tazila opposed secular rationalism, but believed that human intelligence and reason allowed Man to understand religious principles; that good and evil are rational categories that could be "established through reason".

Mu'awiya I (c. 597, 603 or 605–April 680) was the founder and first caliph of the Umayyad Caliphate, ruling from 661 until his death. He became caliph less than thirty years after the death of the Islamic prophet Muhammad and immediately after the four Rashidun ('rightly-guided') caliphs. Unlike his predecessors, who had been close, early companions of Muhammad, Mu'awiya was a relatively late follower of Muhammad.

Mu'awiya and his father Abu Sufyan had opposed Muhammad, their distant Qurayshite kinsman and later Mu'awiya's brother-in-law, until Muhammad captured Mecca in 630. Afterward, Mu'awiya became one of Muhammad's scribes. He was appointed by Caliph Abu Bakr (r. 632–634) as a deputy commander in the conquest of Syria. He moved up the ranks through Umar's caliphate (r. 634–644) until becoming governor of Syria during the reign of his Umayyad kinsman, Caliph Uthman (r. 644–656). He allied with the province's powerful Banu Kalb tribe, developed the defenses of its coastal cities, and directed the war effort against the Byzantine Empire, including the first Muslim naval campaigns. In response to Uthman's assassination in 656, Mu'awiya took up the cause of avenging the murdered caliph and opposed the election of Ali. During the First Muslim Civil War, the two led their armies to a stalemate at the Battle of Siffin in 657, prompting an abortive series of arbitration talks to settle the dispute. Afterward, Mu'awiya gained recognition as caliph by his Syrian supporters and his ally Amr ibn al-As, who conquered Egypt from Ali's governor in 658. Following the assassination of Ali in 661, Mu'awiya compelled Ali's son and successor Hasan to abdicate and Mu'awiya's suzerainty was acknowledged throughout the Caliphate.

Political aspects of the religion of Islam are derived from its religious scripture (the Quran holy book, ḥadīth literature of accounts of the sayings and living habits attributed to the Islamic prophet Muhammad, and sunnah), as well as elements of political movements and tendencies followed by Muslims or Islamic states throughout its history. Shortly after its founding, Islam's prophet Muhammad became a ruler of a state, and the intertwining of religion and state in Islam (and the idea that "politics is central" to Islam), is in contrast to the doctrine of rendering "unto Caesar what belongs to Caesar and to God what belongs to God", of Christianity, its related and neighboring religion.

Traditional political concepts in Islam which form an idealized model for Islamic rule, are based on the rule of Muhammad in Mecca (629–632 CE) and his elected or selected successors, known as rāshidūn ("rightly-guided") caliphs in Sunnī Islam, and the Imams in Shīʿa Islam. Concepts include obedience to the Islamic law (sharīʿa); the supremacy of unity, solidarity and community, over individual rights and diversity; the pledging of obedience by the ruled to rulers (al-Bayʿah), with a corresponding duty of rulers to rule justly and seek consultation (shūrā) before making decisions; and the ruled to rebuke unjust rulers. Classical Islamic political thought focuses on advice on how to govern well, rather than reflecting "on the nature of politics".

Sunni Islam is the largest branch of Islam and the largest religious denomination in the world. It holds that Muhammad did not appoint any successor and that his closest companion Abu Bakr (r. 632–634) rightfully succeeded him as the caliph of the Muslim community, being appointed at the meeting of Saqifa. This contrasts with the Shia view, which holds that Muhammad appointed Ali ibn Abi Talib (r. 656–661) as his successor. Nevertheless, Sunnis revere Ali, along with Abu Bakr, Umar (r. 634–644) and Uthman (r. 644–656) as 'rightly-guided caliphs'.

The term Sunni means those who observe the sunna, the practices of Muhammad. The Quran, together with hadith (especially the Six Books) and ijma (scholarly consensus), form the basis of all traditional jurisprudence within Sunni Islam. Sharia legal rulings are derived from these basic sources, in conjunction with consideration of public welfare and juristic discretion, using the principles of jurisprudence developed by the four predominant legal schools: Hanafi, Maliki, Shafi'i and Hanbali.