Schopenhauer was born on 22 February 1788, in Danzig (then part of the Polish–Lithuanian Commonwealth; present-day Gdańsk, Poland) on Heiligegeistgasse (present day Św. Ducha 47), the son of Johanna Schopenhauer (née Trosiener) (1766-1838) and Heinrich Floris Schopenhauer (1747-1805), both descendants of wealthy German-Dutch patrician families. Neither of them was very religious; both supported the French Revolution, and were republicans, cosmopolitans and Anglophiles. When Danzig became part of Prussia in 1793, Heinrich moved to Hamburg—a free city with a republican constitution —although his firm continued trading in Danzig where most of their extended families remained. Adele, Arthur's only sibling, was born on 12 July 1797.