What is "kaiseraugst"

Kaiseraugst ( Swiss German: Chäiseraugscht) is a municipality in the district of Rheinfelden in the canton of Aargau in Switzerland. It is named for the Ancient Roman city of Augusta Raurica whose ruins are situated nearby. The prefix Kaiser- ("imperial") refers to the fact that this town was part of Further Austria, as opposed to neighbouring Augst, which was in the Swiss canton of Basel.