History of the Caliphate I: Ancient Arabia and the Birth of Islam

1. The Concept of the Caliphate

According to the Encyclopaedia Britannica, the term Caliphate generally refers to the political-religious state comprising the Muslim community and the lands and peoples under its dominion in the centuries following the death (632 CE) of Muhammad. Formally established after the death of the Prophet (8 June 632), it came to an end in 1258 after the fall of Baghdad to the Mongols. The term refers specifically to a high office — initially elective, later hereditary — belonging exclusively to the Islamic world. Although 1258 is given as the date of its conclusion, the title of Caliph later retained a certain vitality, reappearing in various places and periods.

List of all the Arab Caliphs

2. The Caliphate Before the Caliphate

To introduce this topic effectively, it is necessary to make a brief excursus from the remote antiquity of the Arabian Peninsula to the advent of Islam as a religion and as a codified way of life. A question that has fuelled debate for centuries is how the Arabs and their Islamic religion could expand so rapidly. It is worth recalling that the conquests of Muhammad and his first khalifa (“successors”) were part of a long-term process known in the Fertile Crescent since the 3rd millennium BCE: the continuous penetration of Semitic-speaking nomads from the Syrian desert — namely Akkadians, Canaanites, and Arameans.

The Fertile Crescent in 2218 BCE, after the death of the Akkadian king Naram-Sin — Open in Atlas for 2218 BCE

The novelty lies above all in the scale of the event and in the concrete attempt to give the Arab peoples a political-religious unity, entirely unprecedented, starting from Medina and exploiting the fragility of the conquered empires and the appeal of a new religion led by an extremely charismatic figure.

3. How were Pre-Islamic Arab Tribes Organized?

The ancient city of al-Ula (Saudi Arabia), founded around the 8th century BCE — The ancient city of al-Ula (Saudi Arabia), located along the Incense Route, founded around the 8th century BCE

The ancient kingdoms of South Arabia were territorially limited to the southwestern corner of the peninsula, which in general was divided among various tribes often in conflict over control of the Incense Route. Already in pre-Islamic times, the tribes of the peninsula were probably arranged in a genealogical scheme based on the assumption that they all descended from common ancestors: the ancestor of the southern Arabs was considered Qahtan, that of the northern Arabs 'Adnan. Later, these genealogies were linked to the Old Testament: Qahtan was identified with Joktan, grandson of Shem (son of Noah), while 'Adnan became a descendant of Ishmael.

4. What was the Religious Landscape of Pre-Islamic Arabia?

The religious universe of pre-Islamic Arabia was similar to that of the ancient Mediterranean: the area was marked by sanctuaries, usually linked to an oasis and its tribe, dedicated to various deities. Already then, the Ka'ba was among the major centres of attraction, with its cubic temple dedicated to Hubal and the Black Stone still preserved today. Hubal, protector god of the Quraysh, seems to have been worshipped as Allah (a contraction of al-ilah, “the divinity”) together with a goddess called Allat.

Judaism and Christianity penetrated the area from both north and south. It is significant that the Qur'an draws heavily on the historical heritage of the Old Testament, referring far less to the accounts of the evangelists. In this religious context moved the hanif, a sort of itinerant monotheistic holy men, detached from both major Religions of the Book, wandering the desert in search of answers to their spiritual doubts.

5. How did Islam and the Community of Believers Emerge?

Around 570, Muhammad was born. A member of the Hashimite clan of the Quraysh, he prospered through trade, which led him to travel to Syria on behalf of a wealthy widow, Khadija, whom he later married. In 610, the Qur'anic revelation began and continued until his death in 632. The dominant clans of the Quraysh opposed the new religion and Muhammad was forced to flee Mecca for Medina (the Hijra). This event marks the beginning of the Islamic calendar and the birth of the Umma, the Islamic community.

The Caliphate after the death of Muhammad (632)

In the following years, the Umma came to include the entire Arabia, united for the first time, entering the Mediterranean geopolitical scene long dominated by two great powers: to the west Byzantium; to the east the Sasanid Persian Empire.

6. The Rashidun Caliphs and the Great Expansion

The four caliphs who succeeded Muhammad — the so-called Rashidun (“rightly guided”) — were Abu Bakr, 'Umar, 'Uthman, and 'Ali. Military expansion beyond the peninsula began under the second caliph and led to the conquest of Palestine and Byzantine Syria, as well as Sasanian Mesopotamia. The capture of Ctesiphon and the Battle of Nihavand (641–642) opened the way to the conquest of the Iranian plateau.

Maximal Extension of the Rashidun Caliphate — Open in Atlas for 655 AD

A territorial control system was established that would remain influential until the 8th century. The camp-cities of Basra and Kufa formed the base for expansion into Persia, while from Kairouan began the conquest of the Maghreb and later the Iberian Peninsula.

Lorenzo Hofstetter

Historian, COO of Phersu Atlas.

Published on 11 July 2025

Sources

Silverstein, A.J., A Short History of Islam, 2013.
Halm, H., The Arabs, 2006.
Ducellier, A., Eastern Christians and Islam in the Middle Ages. 7th–15th Centuries, 2001.

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