Through the favour of Dukes Odilo and Tassilo, the bishopric received many gifts, and several monasteries arose — e.g. Niederaltaich Abbey, Niedernburg Abbey, Mattsee Abbey, Kremsmünster Abbey — which were richly endowed.
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Under Berengar (1013–45) the whole district east of the Viennese forest as far as Letha and March was placed under the jurisdiction of Passau.
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According to the monastery chronicles authored by Abbot Ermanrich (d. 874), who became Bishop of Passau, the abbey was established in Alamannia about 764 by Herulph and his brother Ariolf, both documented as Chorbishops of Langres.