Pyu city-states
Beikthano ( ) situated in the irrigated Minbu region (near present-day Taungdwingyi) with direct land access to the well-watered Kyaukse plains to its northeast, is the oldest urban site so far discovered and scientifically excavated site. Its remains—the structures, pottery, artefacts, and human skeletons—date from 200 BCE to 100 CE. Named after the Hindu god Vishnu, the city may be the first capital of a culturally and perhaps even politically uniform state in the history of Burma. It was a large fortified settlement, measuring approximately 300 hectares inside the rectangular (3 km by 1 km) walls. The walls and fortifications along it measured six meters thick, and are radiocarbon dated to a period between 180 BCE and 610 CE. Like most subsequent cities, the main entrance of the walls led to the palace, which faced east. Stupas and monastic buildings have also been excavated within the city walls.
Bago, Myanmar
Various Mon language chronicles report widely divergent foundation dates of Bago, ranging from 573 CE to 1152 CE while the "Zabu Kuncha", an early 15th century Burmese administrative treatise, states that Pegu was founded in 1276/77 CE. The earliest extant evidence of Pegu as a place dates only to the late Pagan period (1212 and 1266) when it was still a small town, not even a provincial capital. After the collapse of the Pagan Empire, Bago became part of the breakaway Kingdom of Martaban by the 1290s.