However, Jan Długosz, writing in 15th century and Gesta principum Polonorum do not reference him and there is some question about whether Heinrich was actually bishop.
Modern scholarship has been divided on his historicity, as he is mentioned in a single 12th-century source (Ebo of Michelsberg [de], Vita Ottonis episcopi Bambergensi) and not in any other contemporary sources, including documents related to the Gniezno archbishopric.
Wladyslaw Abraham held that Heinrick became archbishop in 1092 following the death of Bogumiła and before Marcin.
[1] Tadeusz Wojciechowski[2] claimed that Heinrich came from the Abbey of Weltenberg and that he was actually archbishop between Martin and Jacob of Żnin.
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