Starting in the 13th century, the rights to low justice and tithes were held by the Lords of Hallwyl. In the 14th century, these rights changed hands several times (the Freiherr of Fridingen, Freiherr of Grünenberg and the Lords of Ballmoos). In 1484 these rights transferred to Bern, which annexed Ammerwil into the court of Othmarsingen in the Lenzburg district (Oberamt Lenzburg).