 Complete the following phrase:  Böckten was first mentioned as Bettinghofen, which became simplified to Bettinchon first mentioned in 1246, which in turn changed to Betkon first mentioned in 1339. In the Middle Ages Böckten belonged to the earl of Homburg. Its goverce changed several times until it came to Basel in 1467. After the establishing of the Gotthard Pass, the Bischofstein castle was built and completed in 1311 in order to secure the region. It was destroyed due to the 