This church was originally built as a Romanesque basilica in the second half of the 12th century as a parish church for the settlement of Poříčí. Over the centuries it was rebuilt a number of times, and now contributes four towers to the Prague panorama. The church bells are located in a separate freestanding bell tower. After 1989, the church was restituted to the Knights of the Cross with the Red Star.
Source: https://www.prague.eu/en/object/places/1290/church-of-st-peter-kostel-sv-petra