Forest Abbey is a Benedictine Abbey founded in 1105, beside a creek, a tributary of the Zenne, southwest of the city of Brussels. The abbots of Affligem, which had been the ecclesiastical owners of the parish since the bishop of Cambrai ceded it to them in 1105, decided to build a priory for women in Forest, Forest Abbey. The first abbess of the Forest priory was named in 1239. Also in the 13th century, the Romanesque church of Saint Denis was rebuilt in the newer Gothic style. The neighbouring abbatial church was rebuilt in the 15th century.
Relics of Saint Alena, whose cult was popular in the region, were formerly kept both in the parish church and in the abbey church, but since 1796 only in the parish church.
Much of the abbey was destroyed by fire on 26 March 1764. The abbey was suppressed on 8 October 1796 and sold the following year. The buildings that survived the dismantling are now a cultural center for seminars, banquets and exhibitions, owned by the Brussels municipality of Forest.
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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.