After the great crisis of the 3rd century, which shook the political, social and economic structures of the Roman world, Occident went into a historical period known as Late Antiquity (4th-7th centuries), in which the spread of Christianity, becoming the official religion in the 4th century, and the movement of the Germanic peoples had a fundamental role.

Barcino, small in size, well protected by city walls and with a strategic position in the journey between Gallia and Hispania, became the Barcinona of the Visigoth period.