The church in Mętno of an unknown medieval dedication was built in the third quarter of the 13th century. In 1337, the settlement was first mentioned in written sources under the name of Magnum Mantel, and in 1350 the church itself was recorded. After 1534, it was taken over by the Evangelicals and renewed by them in the following centuries. In the second half of the 19th century, a brick apse was added to the chancel. After 1945, the church became a Catholic building again.
The church was built of granite ashlar of regular shape, arranged in equal layers. It obtained the form of a aisleless building with interior dimensions of about 6.8 x 8 meters, with a narrower chancel, 5.5 x 9 meters, unusually longer than the nave, originally closed straight on the eastern side. From the west there was a tower wider than the nave, and on the south side of the chancel a four-sided sacristy. The church received massive walls 1.1 meters thick, and even 1.8 meters in the tower. The ground floor of the latter originally opened onto the nave by a wide arcade with a circular arch, while on the other side it was accessible with a pointed, stepped portal. The interior of the nave and chancel were covered with timber beam ceilings, only in the sacristy there was a barrel vault.
The layout and shape of the church have remained practically unchanged since the Middle Ages, with the exception of the demolished eastern wall of the chancel, which gave way to the early modern, brick apse. Inside, the arcade between the tower and the nave was partially walled up. Currently, the monument still serves liturgical functions for the local Catholic community.
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