St Adamnan's Church is situated in an isolated position, surrounded by open farmland on the eastern coast of the island, between Groudle Glen and Baldrine. The eastern (and oldest) part of the church has been restored, but it is otherwise in a ruinous, though well-tended, condition. St Adamnan was the Abbot of Iona between 679 and 704.
The site on which the church stands is of ancient religious significance. The church yard contains Celtic crosses, the oldest of which dates backs to the 5th century AD - evidence of an early keeill. In about 1190, King Reginald of the Isle of Man gave a grant of the land of Escadala, in the Isle of Man to St Bees Priory, in Cumbria. It is likely that the site of the church was included in the grant, to which fact its subsequent reconstruction and selection as the parish church (despite its remoteness) are attributable.
On 25 June 1733, an Act of Tynwald was passed for the building of a new parish church at Boilley Veen, in a more convenient part of the parish, but the new church was not in fact completed.
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.