Augusta Raurica was founded in 44 BC, on a hill about 500 m inland from the Rhine. It was an important settlement which, at its height, had a population of about 15,000. In the 3rd century, amid great instability in the empire, the northern frontier of the empire shrank back to the Rhine and a large fort was constructed on the banks of the river while the original town was abandoned. The fort then became the settlement of Kaiseraugst for several centuries, but was overshadowed completely from the 8th century with the rise of Basel.
I spent about two hours in the area, which gave me time to see the ruins in the centre of the original town and also to visit the museum.