The attic is decorated with coat of arms of Poland, Gdańsk and Royal Prussia and four sculptures.
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Bartholomaeus Schwartz (latinised to Bartholomaeus Nigrinus) (1595–1646) was pastor of the St. Peter and St. Paul's Church in Danzig (Gdańsk), Royal Prussia (now Poland).
He was one of the engineers working on fortifications in Großendorf (Władysławowo) and at Hela where Pomerania and Royal Prussia meet, (now Hel Peninsula) together with Johann Pleitner.
Congruent with the Kingdom of Prussia proper (i.e. former Ducal and Royal Prussia), its territory, like the Greater Polish territory of Posen, was not part of the German Confederation.
The only personal information available is what he wrote himself in his work: that he was a Dominican priest from Tolkemit (now Tolkmicko) near Frauenburg (now Frombork) just north of Elbing (Elbląg) in Royal Prussia.
Under Polish sovereignty, Prussians, particularly those from the Royal Prussia, saw their liberties confirmed and expanded; local cities prospered economically (Gdańsk become the largest and richest city in the Commonwealth), and local nobility participated in the benefits of Golden Liberty, such as the right to elect the king.