Priory Palace (Russian: Приоратский дворец) is an original palace in the formerly royal town of Gatchina (Гатчина), Leningrad oblast, Northwest Russia, a suburb of Saint Petersburg. It was built in 1799 by the architect N. A. Lvov on the shore of the Black Lake (Chyornoye ozero / Чёрное озеро). Constructed for the Russian Grand Priory of the Order of St John, it was presented to the Order by a decree of Paul I of Russia dated August 23, 1799.