He may have been of Prussian descent, although medieval Chronicler, Jan Długosz claims Polish origines. He had at least a school level education, and may have obtained a university degree, as Jan Długosz considered him to be a scholar.
He was Chancellor for Siemowit I of Masovia from before 21 April 1256 and in a document dated 19 November 1257 was Canon to Andrzej Ciołka the Bishop of Płock. and was made bishop himself in 1271.
In 1282 he visited Pomerania, and he lived until sometime after 6 May 1294.
- Diocese of Płock at GCatholic.org.
- T. Zebrowski, Outline the history of the Roman Catholic Diocese of Płock, Płock, 1976, page 34
- P. Nitecki, Bioshops in Poland: The Church from 965-1999. Biographical Dictionary, London, 2000, p. 450 and 22
- M. Maciejowski, Political Orientations of the Bishops of Gniezno metropolis: 1283-1320, Kraków 2007, page 41
- Ioannis Dlugossii Vitae episcoporum Plocensium abbreviatae cum continuatione Laurentii de Wszerecz. Cited in Kętrzyński, Monumenta Poloniae Historica, Kraków, 1893, page 606.
- M. Maciejowski, Political Orientations of the Bishops of Gniezno metropolis: 1283-1320, Kraków 2007 pages 61-62
- Codex diplomaticus Poloniae. Translated L. Rzyszewski, A. Muczkowski, London, 1847
- Das Bisthum Culmen unter dem deutschen Orden 1243-1466. C.P. Woelky, Danzig, 1885, no. 52.
- Codex diplomaticus Poloniae. trans L. Rzyszewski, A. Muczkowski, Warszawa 1847, page 45.
- Urkundenbuch des Bisthums Culm, T. 1, Das Bisthum Culm unter dem deutschen Orden 1243–1466, wyd. C.P. Woelky, Danzig 1885, page52.
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