He was educated at the Benedictine Niederaltaich Abbey, and was made bishop in 971.
By these he attempted to obtain from Benedict VI the elevation of Passau to an archdiocese, the re-erection of those dioceses in Pannonia and Mœsia which had been suffragans of Lorch, and the pallium for himself.
There is extant an alleged Bull of Benedict VI granting Piligrim's demands; but this is also the work of Piligrim, possibly a document drawn up for the papal signature, which it never received.
Piligrim converted numerous pagans in Hungary.
He built many schools and churches, restored the Rule of St. Benedict in Niederaltaich, transferred the relics of Maximilian of Tebessa from Altötting to Passau,[2] and held synods (983–991) at Ennsburg [de] (Lorch), Mautern an der Donau, and Mistelbach.