 South of the Lindenhof "Castrum", at the location of the St. Peter church, there was a temple to Jupiter.An island sanctuary of the Helvetii in connection with settlement the preceding Oppidi Lindenhof and the 1st century BC settlement at the Lindenhof hill may have probably go back to the La Tène culture.During the reign of Emperor Hadrian, a round wooden temple as an island sanctuary was built on the "Grosser Hafner" island, which allows a dendrochronological dating.