The Domus Municipalis is the most architecturally remarkable building inside Bragança's citadel, and arguably in the city. This 12th-century Romanesque hall served as the meeting place for the citadel's governing council, and is one of the rarest surviving examples of civic Romanesque architecture in the Iberian Peninsula.
The building is pentagonal, with a lower level that served as a cistern and an upper level open on three sides through a series of Romanesque arches. Its form is entirely determined by function: the arched gallery sheltered the council, the cistern below stored rainwater for the citadel. There is almost no ornament — just precise stone geometry. It sits next to the Church of Santa Maria do Castelo, which adds a fine Romanesque apse alongside it. Together the two buildings make the citadel worth the detour even for those not particularly interested in medieval fortifications.