King Pyinbya fortifies Pagan, laying the foundation for Myanmar’s first empire

Story: 849 C.E.  |  Last updated: January 1, 0849

In 849 C.E., a king named Pyinbya ordered the fortification of a small city along the Irrawaddy River in what is now central Myanmar. It was not yet an empire. But that act of building walls around Pagan — known today as Bagan — set in motion two centuries of growth that would produce one of the most remarkable kingdoms in Southeast Asian history.

What the evidence shows

• Pagan Kingdom: The fortification of Pagan city in 849 C.E. by King Pyinbya is recorded in Burmese chronicle tradition and marks the consolidation of the early Mranma settlement that would grow into the first unified Burmese state.
• Mranma settlement: Modern scholarship holds that the founders were Mranma people, likely descended from migrants connected to the Nanzhao kingdom of Yunnan, who settled in the Irrawaddy valley after the collapse of the older Pyu civilization in the early 9th century C.E.
• Bagan archaeological zone: Archaeological evidence in the region extends back to at least 11,000 B.C.E., and the Pyu people had built water-management systems and urban centers as early as the 2nd century B.C.E., giving the Pagan Kingdom deep civilizational roots to draw from.

A city built on older foundations

Pagan did not emerge in a vacuum. For centuries before Pyinbya’s walls went up, the Irrawaddy valley had been home to the Pyu people — one of Southeast Asia’s earliest urban civilizations. The Pyu built walled cities, developed water infrastructure, and maintained contact with Indian cultural traditions by at least the 4th century C.E.

Then came the disruption. Repeated raids by the Nanzhao kingdom of Yunnan between the 750s and 830s C.E. shattered the Pyu realm. The Mranma people — the predecessors of the modern Bamar ethnicity — moved into this space. They were not newcomers to the region; over generations, Mranma and Pyu communities had already been mixing. The fortification of Pagan in 849 C.E. was less a sudden founding than a crystallization of something that had been forming for decades.

From small principality to empire

For roughly two hundred years after Pyinbya, Pagan remained a modest principality. The transformation came in the 1050s and 1060s C.E., when King Anawrahta unified the Irrawaddy valley and its surrounding regions under a single polity for the first time. This is what historians typically call the founding of the Pagan Empire — or the First Burmese Empire.

By the late 12th century C.E., Anawrahta’s successors had extended their reach south into the upper Malay Peninsula, east toward the Salween River, north toward the present Chinese border, and west into northern Arakan and the Chin Hills. Alongside the Khmer Empire, Pagan stood as one of the two dominant powers in mainland Southeast Asia during the 12th and 13th centuries C.E.

Language, Buddhism, and 10,000 temples

What Pagan built was not only political. The kingdom’s 250-year rule over the Irrawaddy valley drove the spread of the Burmese language and culture across Upper Myanmar, gradually eclipsing older Pyu, Mon, and Pali-influenced norms by the late 12th century C.E.

Theravada Buddhism, too, found fertile ground here. Pagan’s rulers and wealthy donors constructed over 10,000 Buddhist temples in what is now the Bagan Archaeological Zone, a UNESCO World Heritage Site. More than 2,000 of those structures still stand today. The religious energy of the kingdom was not monolithic — Vajrayana, Mahayana, Brahmanist, and animist practices remained embedded at all levels of society — but Theravada’s eventual dominance in Myanmar and across mainland Southeast Asia traces directly to the momentum generated during the Pagan period.

The classical Pali name for the city, Arimaddanapura — “Foe-Crushing City” — signals how Pagan’s rulers projected power. But the Ceylon chronicles also record diplomatic correspondence, treaty-making, and scholarly exchange between Pagan and Sri Lanka, suggesting a kingdom engaged with the wider Buddhist world in ways that went far beyond military strength. According to some sources cited in those chronicles, the city was notable for its learned women — a detail that complicates any simple picture of medieval Burmese society.

Lasting impact

The Pagan Kingdom’s most durable contribution may be linguistic and religious rather than territorial. The dominance of the Burmese language in Myanmar today, and the country’s identity as a center of Theravada Buddhism, both trace their roots to the cultural work done during the Pagan period. The kingdom created a template — a shared language, a religious architecture, a political geography — that successive Burmese states would return to even after Pagan itself was gone.

The physical legacy is staggering. The plains of Bagan, dotted with thousands of brick temples built across roughly two centuries, remain one of the most extraordinary archaeological landscapes in the world. They were built by rulers, yes — but also by thousands of unnamed craftspeople, monks, laborers, and donors whose contributions the chronicles rarely record by name.

Blindspots and limits

The kingdom’s founding narratives — which trace Pagan’s origins to the clan of the Buddha and to events in 9th-century B.C.E. India — reflect later political mythology more than historical record. Much of what we know comes from chronicles written down centuries after the events they describe, and modern scholarship continues to reconstruct the early Pagan period using archaeology and comparative sources rather than taking those chronicles at face value. The voices of the Pyu, Mon, and other peoples absorbed or displaced by Pagan’s expansion are largely absent from the surviving record, and the costs of that expansion for those communities remain difficult to assess.