A small beginning with a thin record
The Ottomans, named after their early leader Osman, started out around 1300 as one of several Turkish-led groups on the northwestern edge of Anatolia. The sources for this period are unusually weak. No reliable chronicle was written by someone who knew Osman, and the best-known accounts were composed about a century and a half later, when the dynasty had a reason to polish its origins. As a result, historians treat the famous stories, such as Osman’s dream of a tree growing from his body to cover the world, as legend rather than evidence. Even the date of his death is uncertain.
The setting: a world of beyliks
Anatolia had been transformed from the eleventh century onward, after the Battle of Manzikert (1071) opened the plateau to Turkish settlement. Over time the Seljuk Sultanate of Rum became the leading power, but it was crushed by the Mongols at Kose Dag in 1243 and then declined into a dependent, fractious state. As its authority weakened, border lords, or beys, built local power of their own.
The Ottoman lords held territory near Bithynia, close to the Byzantine frontier. This location mattered. Byzantine control there was weak, since the empire had shifted its attention to Europe after regaining Constantinople in 1261 and had limited resources for the Anatolian countryside. Nearby Byzantine towns and estates were exposed, and Turkish groups could raid, settle and gradually take control.
Why did this group succeed?
There is no agreed answer, but several factors are commonly proposed:
- Location. The Ottomans were next to the Byzantine lands, which offered targets, and farther from the Mongol-influenced areas to the east.
- Mixed following. Their early supporters seem to have included Turkish nomads, settled farmers, religious figures and, at times, local Christians and Byzantine converts. Some early commanders had Greek names.
- Flexible politics. Rather than burning everything in their path, they often negotiated surrenders and kept local elites in place.
- Luck and timing. Byzantine civil wars and the aftermath of Mongol pressure reduced the opposition.
An older theory by the historian Paul Wittek argued that the early state was driven by ghazi identity, meaning warriors of the faith on a frontier. Later scholars have argued that this overstates religion and understates plunder, politics and cooperation across religious lines. The dispute remains unresolved, and a cautious reader should avoid either simple version.
From Osman to Orhan
Osman’s son Orhan transformed a raiding band into a more organized state. His capture of Bursa, traditionally dated to 1326, gave the Ottomans a real city with markets and mosques as a capital. Nicaea fell around 1331 and Nicomedia a few years later. The first Ottoman coins and religious endowments belong to this early stage, suggesting a growing interest in institutions rather than raiding alone, though the dates of some of these are debated.
Orhan also absorbed a neighboring Turkish principality, Karasi, in the 1340s, which gave the Ottomans a coastline facing the Dardanelles and an experienced seafaring population.
Crossing into the Balkans
Byzantine political quarrels opened the door to Europe. During the civil war of the 1340s, John Kantakouzenos, a claimant to the throne, asked Orhan for military help and secured it in part through a marriage alliance. Ottoman troops raided Thrace as allies. In 1354, an earthquake wrecked the walls of Gallipoli, and an Ottoman force led by Orhan’s son Suleyman took the opportunity to occupy it.
Once Gallipoli was held, it stayed in Ottoman hands. This gave the dynasty a permanent base on European soil. Over the following years, Ottoman forces and Turkish settlers moved into Thrace, and by around the 1360s, Adrianople (Edirne) had fallen. Dates vary between sources, but the pattern is clear: a series of gains made while the Balkan states were divided among themselves.
A fragmented target
The Balkans at that time were not facing a united front. The Serbian empire of Stefan Dusan, built up in the mid-fourteenth century, broke apart after his death in 1355. Bulgaria was divided, and the Byzantine Empire was reduced and weakened by civil wars and the fallout of the Black Death, which struck the region in the late 1340s. Regional rulers often fought each other, sometimes inviting Ottoman help. Later Ottoman rulers used this disunity, imposing vassalage on Balkan princes before annexing them.
What this early phase shows
Looking at this period, the later empire is easy to project backward, but in 1300 nobody would have predicted it. The early Ottoman state was one of many, and its rise depended on contingencies: a weak neighbor, divided opponents, and capable early rulers. By the 1360s the dynasty was a European as well as an Anatolian power. The wider course of Ottoman expansion, including the later defeats and recoveries, is a longer story that continued into the following centuries.