A merchant from Mecca who, within roughly two decades, turned a landscape of feuding tribes into a single political community bound by written law rather than blood ties.
Pre-Islamic Arabia organized itself around tribal loyalty: protection, law, and revenge all ran through kinship, which meant no authority existed above the tribe and disputes between tribes routinely escalated into cycles of raiding and retaliation. Muhammad ibn Abdullah (c. 570-632 CE), born in Mecca and orphaned young, worked as a merchant before beginning, around age 40, to recite what he described as divine revelation, the material later compiled as the Quran. Meccan opposition to his preaching eventually forced him and his followers to emigrate to the neighboring city of Yathrib in 622 CE, an event known as the Hijra and now the starting point of the Islamic calendar. It is this second half of his life, as the builder of a functioning political and economic order in Yathrib, renamed Medina, that gives him a role in institutional history distinct from his religious one.
The Constitution of Medina
On arrival in Medina, Muhammad drafted a written agreement, now generally called the Constitution of Medina, among the city’s competing groups: his own migrant followers, the local Arab clans who had invited him to arbitrate their disputes, and several Jewish tribes. The document, preserved in the early biographical sources, bound these groups into a single political community, the ummah, while explicitly guaranteeing the Jewish tribes religious freedom, internal legal autonomy, and a share in collective defense. Muhammad himself was named final arbiter of disputes the pact could not settle. Historians of early Islam, including W. Montgomery Watt, have described it as among the earliest surviving documents to constitute a multi-tribal political community by mutual agreement rather than by conquest or shared descent, and some scholars credit it as an early precedent for enshrining religious pluralism in a governing charter. Whatever its precise legal novelty, it marks a documented shift from tribal retaliation toward a common law binding groups that had no kinship tie to one another.
Economic Reforms
Muhammad’s Medina-period teaching also restructured the local economy. He prohibited riba, the fixed, risk-free return on lent capital, and he institutionalized zakat, an obligatory wealth transfer from those above a set threshold to the poor, a mechanism distinct from voluntary charity in that it functioned as a structural, regularly assessed levy. He also established market oversight, later formalized as hisbah, to police honest weights, pricing, and trade practices in the marketplace he founded in Medina rather than allowing existing merchant monopolies to set terms. Together these measures were aimed less at abolishing commerce than at redirecting it away from compounding, risk-free returns to capital and toward circulation and redistribution within the community.
Religious Status
Within Islamic belief, Muhammad holds a specific and bounded theological position: he is regarded as the last in a line of prophets that includes, among others, Abraham, Moses, and Jesus, a status termed khatam an-nabiyyin, “seal of the prophets.” Muslims consider the Quran he transmitted to be the final revelation in that line, and his recorded words and conduct, compiled as hadith, form a second major source of Islamic law alongside the Quran itself. This is a claim of religious doctrine, not a historical finding, and is presented here descriptively rather than as an assertion of the entry.
Muhammad died in Medina in 632 CE having brought most of the Arabian Peninsula under a single political and legal order for the first time in its history. Within a century, the state his successors built from that order had expanded from Spain to Central Asia, a trajectory secular historians generally attribute to the institutional and military structures established in his lifetime rather than to any single later ruler.
Source: W. Montgomery Watt, Muhammad at Medina (1956); Karen Armstrong, Muhammad: A Biography of the Prophet (1991); Britannica, “Constitution of Medina.”