Cathedral Basilica of the Assumption

The first church built on this site was a small wooden Roman Catholic church dedicated to the Holy Trinity, built in 1344 and lost in a fire six years later. In 1360, the king Casimir III of Poland founded the construction of the present day church, built in Gothic style, for a cathedral of the newly created Latin diocese. nThe cathedral witnessed many significant events and was visited by several Polish kings, most notably John II Casimir, who in the Cathedral entrusted the Polish-Lithuanian Commonwealth under the care of the Blessed Virgin in what came to known as the Lwów Oath.