Built in the 12th century, San Pedro de la Rúa is the oldest church in Estella. The sanctuary dating from the end of the 12th century is still standing. It has three naves, dating from around the 13th century. The chapel of San Andrés is Baroque and has a Rococo altarpiece. At the foot of the church there are baroque stalls and a font. The exterior cloister has a square plan and in it there are decorated capitals that narrate the life of Saints and Christ, along with plants and animal reliefs.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.