Like his friend Bishop Altmann of Passau he did not attend the 1076 Synod of Worms held by the king and instead allied with the oppositional princes at the diet of Trebur later in that year.
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About 1076 Archbishop Gebhard of Salzburg, a follower of Pope Gregory VII in the Investiture Controversy, had the Petersberg fortress erected above the town in order to prevent Emperor Henry IV from crossing the Alps.