The World the Ottomans Inherited

The year was 1243. On the windswept plains of Köse Dağ, in the highlands of eastern Anatolia, two armies faced each other across a narrow valley. On one side stood the assembled forces of the Seljuk Sultanate of Rum—men from a dozen different peoples, speaking a dozen different languages, united only by their desperation to hold back the tide that had been rolling westward for a generation. On the other side, under the golden banners of the Mongols, rode the disciplined horsemen of a force that had already shattered empires from China to the Caspian Sea. When the battle ended, so did an era.

What happened at Köse Dağ would echo through the centuries that followed, setting in motion a chain of events that would eventually give rise to one of the most remarkable empires in human history—the Ottoman Empire. But in the summer of 1243, no one watching the rout of the Seljuk armies could have predicted such an outcome. The Mongols, after all, were simply the latest in a long line of conquerors who had swept through Anatolia. What made their victory different was not its violence but its permanence. The Seljuk state that crumbled that day would never recover, and from its ruins would eventually emerge something entirely new: a Turkish-Muslim principality that would grow, over three centuries, into a transcontinental empire stretching from Vienna to the Persian Gulf, from the Crimea to the gates of Cairo.

To understand how the Ottomans built their extraordinary state, we must first understand what they inherited. This is not merely a matter of tracing genealogy or enumerating territorial holdings. The world of the thirteenth and early fourteenth centuries was a world in violent transition—a world where ancient empires were dying, where new powers were being forged in the crucibles of conquest and adaptation, and where the very geography of power was being redrawn by forces that seemed almost geological in their inexorability. The Anatolia that Osman I, the namesake and founder of the Ottoman dynasty, would survey in the late thirteenth century was not the Anatolia of his grandparents. It was a shattered landscape, both politically and spiritually, where the old certainties had collapsed and where, in that collapse, lay the seeds of something unprecedented.

Let us begin, then, with the broken kingdom that the Ottomans would one day claim as their rightful inheritance: the Seljuk Sultanate of Rum.

The Sultanate of Rum: A Kingdom of Two Worlds

The name itself carries a certain irony that speaks to the peculiar history of this state. "Rum" was the Arabic and Turkish word for Rome, a designation inherited from the Byzantine Empire that the Seljuks had conquered. The Seljuk Turks, originally a nomadic people from the steppes of Central Asia, had swept into the Islamic world in the eleventh century, establishing a vast empire that stretched from Central Asia to Anatolia. In 1071, their commander Alp Arslan had defeated the Byzantine Emperor Romanos IV Diogenes at the Battle of Manzikert, opening Anatolia to Turkish settlement for the first time. Within a generation, Turkish principalities—freebooting bands of gazis (warriors for the faith), Turkmen nomads, and ambitious military commanders—had poured through the mountain passes and established themselves across the peninsula.

The Sultanate of Rum emerged from this chaos as the most powerful of these new Turkish states. Centered on the ancient city of Konya, the Seljuks of Rum built a sophisticated civilization that synthesized elements of Persian, Turkish, and Byzantine culture. Their court attracted scholars, poets, and artists from across the Islamic world. The great Persian poet Jalal ad-Din Muhammad Rumi, whose spiritual poetry still moves readers eight centuries later, lived and worked in Konya during the height of Seljuk power. The Seljuks sponsored monumental architecture, established universities, and developed trade networks that connected Anatolia to the great commercial arteries of the medieval world.

Yet the Sultanate of Rum was always a kingdom of two worlds, never quite at home in either. Its rulers claimed descent from the great Seljuk sultans of Persia, and they modeled their court on the ceremonial traditions of the eastern Islamic empires. At the same time, they ruled over a population that was still largely Greek-speaking in the cities and Armenian in the highlands, with a substantial Kurdish presence in the south and east. The Turkmen nomads who had helped establish the state remained outside the orbit of court culture, following their own leaders and their own codes of honor. Managing these competing constituencies required constant balancing, and the sultanate's rulers were never entirely successful in creating a unified political identity.

This internal fragmentation became increasingly dangerous as external threats mounted. The Crusades, beginning with the First Crusade in 1096, brought European armies to Anatolia and created a permanent zone of conflict along the empire's western frontier. The Byzantine Empire, though weakened, was not destroyed by Manzikert, and under capable emperors like John II Comnenus and Manuel I Comnenus, it launched repeated campaigns to reclaim lost territory. The Seljuks of Rum found themselves fighting on multiple fronts, draining resources and attention from the internal consolidation that might have made them more resilient.

Most critically, the sultanate never developed the administrative infrastructure that might have bound it together. Unlike the Byzantine Empire with its traditions of centralized bureaucracy, or the great Islamic caliphates with their systems of taxation and land grants, the Seljuk state remained dependent on personal relationships between the sultan and his military commanders. When the sultan was strong, the empire held together. When he was weak—or when disputed successions created rival claimants—the centrifugal forces that had always been present came to dominate.

By the early thirteenth century, the Sultanate of Rum had reached its zenith under Kayqubad I (reigned 1220–1237), a ruler of considerable ability who extended Seljuk control across much of Anatolia and established diplomatic and commercial ties with both the Mamluks of Egypt and the Mongol successor states to the east. Kayqubad's reign was a period of architectural achievement and cultural florescence, but it was also the calm before the storm. The Mongols were already reshaping the political landscape of Eurasia, and the forces they unleashed would prove catastrophic for the already-fragile Seljuk state.

The Mongol Storm: Engines of Destruction and Transformation

To understand the impact of the Mongols on Anatolia, we must first appreciate the sheer scale of what occurred in the first half of the thirteenth century. Few events in human history have reshaped the world so rapidly or so thoroughly as the Mongol conquests. Within a few decades, the armies of Genghis Khan and his successors had created the largest contiguous land empire in history, stretching from the Pacific coast of Asia to the heart of Europe. They had destroyed states that had existed for centuries—the Khwarazmian Empire, the Jin dynasty of northern China, the kingdom of Georgia—and reduced major cities to rubble. Their reputation alone caused kingdoms to surrender without fighting; their actual military capabilities were such that those who did resist usually suffered devastation on a scale that contemporaries found almost incomprehensible.

The Mongols first appeared on the western edges of the Islamic world in the 1220s, when expeditions sent by Genghis Khan pursued the fleeing Khwarazmian Shah Muhammad II into territories that had previously been outside Mongol control. These were not full-scale invasions but punitive raids, and the Seljuks of Rum managed to remain uninvolved by maintaining diplomatic neutrality. Kayqubad I, pragmatic as always, sent envoys to the Mongol court and of