In the obituaries of the monasteries in Weltenburg and of St. Emmeram in Regensburg he is styled as episcopus de Polonia, that is a bishop of the Polish diocese, most likely of Poznań.
Kętrzyński[1] and Abraham[2] date his time in Poznan as the end of the 11th or beginning of the 12th century, and according to Tadeusz Wojciechowski,[3] he travelled to Poland with Judith the second wife of Władysław Herman.
This claim is based on close relationships Judith had with the monastery in Weltenbergu.
[4] His time in the Diocese of Poznań was during a period of pagan reaction (c. 1031AD) and the invasion Of Bretislaus in 1038AD.
It was due to these two events that Diocese of Poznan ceased to exist de facto.