In the early fifteenth century, Franciscan Third Order Regular communities began to be established in Ireland. In 1445 the archdeacon of Connor was sent a mandate by Pope Eugenius VI, authorising him to establish a Franciscan Third Order Regular friary in his diocese.
A 1580 map of the County Antrim coastline shows the friary at ‘Glanarme’ on the other side of the river from the castle. It was probably closed by the beginning of the seventeenth century, but its site continued to be the favoured burial place of the local population, including settlers from Scotland.
Little of the friary survives today, and what remains is not easy to interpret. It was aligned along the traditional east-west axis, so what was once thought to have been the chancel is now believed to have been a transept.
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.