When Rudolf died on October fifteen, 1080, in Merseburg, his territories were being inherited by Berthold II of Zähringen.although the town went to his son Otto and his relatives the von Wetter's. Berhold's 2nd son, Conrad, awarded sector rights to town, which makes it the oldest Zähringerstadt in Switzerland and https://reidwelrw.wikitron.com/127713/the_basic_principles_of_zahnarzt_rheinfelden