The church of Saint-Pierre d'Andenelle with its tower dates from the 12th century. Built of reddish sandstone, this remarkable monument of Mosan architecture is one of the oldest in the region. It underwent alterations in the 17th century (the inside pillars were changed), in 1853 (the entrance portal, which used to be found in the north, was moved to the west), in 1860 (building of the transept), in 1875 (the portal was moved to the north as a result of the building of the Andenne-Haillot road) and in 1923 (building of the side aisles). It is a mistake to believe that it was built in a hollow. In times past, it was level with the road and the square. People entered on a level, through a big door at the foot of the tower, next to the stream. But when the Haillot bottom road was built, the portion of the road was raised and people had to go down a few steps to enter the church.
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.