"Mathias Czwiczek also Maciej Croiczek, Cwiczeck, Cwiczek, Cwiczeke, Czwiczeck, Czwiczek, Czwiczik, Schwetzge and Schwezge (1601, Královec – 1654, Königsberg), was a Bohemian painter active in Brandenburg-Prussia." - (Wikipedia (en) 17.10.2020)
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