[1] Tests have shown that the roof of the church can be dated to 1216, making it the oldest religious building in Schleswig-Holstein.

[2] According to legend, the Danish king Canute the Great (995–1035) provided money and stones for a church to be built in Keitum.

[3] The nave, recessed chancel and the semicircular apse are built of naturally coloured granite blocks, white-plastered tuff and brick.

Cross-arched and stepped friezes decorate the exterior of the apse while zigzag and lozenge designs top the nave and chancel walls.

[3][6] The interior of the church was refurbished in 1985 - the wooden panels, pews and fittings were restored to their original light green colour.

[3][6] Dating from 1230, the oldest piece in the church is the Bentheim sandstone baptismal font which stands on a base with four lions at the corners.

It depicts God the Father with the Risen Christ flanked by Mary with the infant Jesus and Bishop Severin.