The Double Church of Schwarzrheindorf stands in a district of Bonn. It was dedicated in 1151 in the presence of King Conrad III, probably for Arnold of Wied, who likely built it as a private chapel, and who became Archbishop of Cologne that year. After his death his sister Hadwig turned the buildings into a Benedictine nunnery in 1156. The style is Romanesque.
It has two levels, an upper church dedicated to the Virgin Mary and a lower church dedicated to Pope Clement I. It was originally a central structure without a nave, modeled on the Palatine Chapel in Aachen. A tall crossing tower and a dwarf gallery around the apse and transepts are reached by an external staircase. The upper gallery was reserved for noble members of the community.
The frescoes are largely original from the twelfth century. They were rediscovered beneath white plaster in 1863.

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