The church was erected in 1803, according to the design by Christian Aigner, on the northwest corner of the palace hill that belonged to the Czartoryski family. Outside, eight Corinthian columns decorate the portico, and the building is topped with a dome featuring a large skylight in the middle. The inscription “To the Mother of God Assumed into Heaven” is placed above the portico, while the inscription “Remembering the faith and virtue of my beloved Mother, Marya née Sieniawska Princess Czartoryska, I dedicate [this church] W.R. Prince Adam Kazimierz” was added above the entrance at the request of the founder of the church. Inside the church, a gallery supported by twelve Ionic columns and located by the walls encircles the interior. The church also features a marble pulpit, stucco works by F. Bauman and the copy of Raphael’s Madonna. At present, the noteworthy objects that have been transferred from the palace chapel are displayed inside and include the altar, confessionals and pews.