The church of the Assumption was founded in the years 1326-1364 by princess Zofia, wife of Barnim IV. Initially Knights Hospitaller patronized it. In the first half of the fifteenth century it was enlarged by a northern chapel and a rows of chapels by the tower. Temple equipping continued until the second half of the 15th century. Since the 16th century the church was a Protestant temple and returned to Catholics after the Second World War. After the Soviet troops entered Sławno in 1945, the church was destroyed. The interior of the nave and tower was then burned down, and the vault over the presbytery collapsed. The Franciscan Order, which took care of the temple, began its rebuilding, which lasted until the end of the 1950s.
The church was erected from ceramic brick in the monk bond on stone foundations. It is a three-nave basilica, set on a rectangular plan with a lower, polygonal chancel. In the fifteenth century a four-span chapel from the north and a small double-span sacristy from the south were added. A pointed frieze is circling tower, while the elaborate ornament running under the roof of the basilica has a sign of cross. The main decorative motif of the tower are blendes, which frames are from profiled brick. Outside, the church is clasped with buttresses, between which there are pointed arch windows. The gables of the aisles are filled with blendes. The chancel, the nave and the aisles have a stellar vaults, while the church’s porch has a rib vault.
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Website zabytkowekoscioly.net, Sławno, kościół Panny Marii i św. Jana Chrzciciela, dawny joannitów.