The oldest trace of settlements in Bremgarten are from the Roman era and include a settlement, cobbled roads and Roman coins. During the Middle Ages there was a castle and village at Bremgarten, though no trace remains. However, in 1978, the outer curtain wall of the old castle was discovered. The castle, the home of the Lords of Bremgarten, was located at a narrow point on the Aare peninsula. The castle was the center of a barony that stretched along the Aare river at least as far as from Worblaufen to Kirchlindach. The Bremgarten family's personal church, St. Michaels Church was first mentioned in 1275, though it was built in the 10th or 11th century and the choir was rebuilt in 1306.