História de Braga
Human occupation of the region of Braga dates back thousands of years, documented by vestiges of monumental structures starting in the Megalithic era. During the Iron Age, the Castro culture extended into the northwest, characterized by Bracari peoples who occupied the high ground in strategically located fortified settlements (castrum).
The region became the domain of the Callaici Bracarii, a Celtic[10] tribe who occupied what is now northern Portugal, Galicia and Asturias in the northwest of Iberia.
The Romans began their conquest of the region around 136 BC, and finished it, by conquering the northern regions, during the reign of Emperor Augustus. The civitas of Bracara Augusta was founded in 16 BC; in the context of the administrative reorganization of these Roman acquisitions, Bracara was rededicated to the Emperor taking on the name Bracara Augusta. The city of Bracara Augusta developed greatly during the 1st century and reached its maximum extension around the 2nd century.
Towards the end of the 3rd century, the Emperor Diocletian promoted the city to the status of capital of the administrative area Conventus bracarensis, the southwestern area of the newly founded Roman province of Gallaecia.