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Nendrum Monastery was a Christian monastery on Mahee Island in Strangford Lough, County Down, Northern Ireland. Medieval records say it was founded in the 5th century, but this is uncertain. The monastery came to an end at some time between 974 and 1178, but its church served a parish until the site was abandoned in the 15th century. Some remains of the monastery can still be seen.
The island monastery of Nendrum was traditionally founded in the 5th century by Machaoi, after whom Mahee Island is named, although a later date for the foundation has been suggested. However, dendrochronology has dated a tide mill on the island to the year 619, making this the oldest excavated tide mill anywhere in the world. The monastic site included orchards, gardens, pastures, arable fields, and a guest-house.
In his Ecclesiastical Antiquities of Down, Connor, and Dromore, William Reeves notes that several annals record the death of St Mochaoi of Nendrum at a variety of dates between 490 and 497. He considers that Nendrum was early chosen as the seat of a bishop, quoting the Annals of Tigernach and the Annals of Ulster, both of which describe Cronan (died c. 640) as "bishop of Nendrum".There are references to Nendrum in various sources, such as the Annals of the Four Masters, between the 7th century and the year 974, when the Four Masters record that "Sedna Ua Demain, Abbot of Nendrum, was consumed in his own house". This is read as meaning that Sedna was burnt, perhaps during a Viking raid, and is the last heard of Nendrum in the annals. Reeves says –
Probably it was pillaged and demolished soon after by the Danes, whose ships were continually floating in Strangford Lough. When the name next occurs, it is as belonging to property of the see of Down, with which John de Courcy, in 1178, takes the liberty of making it over to the monks of an English abbey. It would seem, however, that long ere this it held some tributary relation to the see of Down...
The English monks were Benedictines and founded a small cell on Mahee Island. However, in 1306 Nendrum was recorded as a parish church, and during the 15th century it was abandoned for a new site at the village of Tullynakill. The location of Nendrum was then lost until it was rediscovered in 1844 by William Reeves, who visited the island searching for the church recorded in 1306 and recognized the remains of a round tower.
Since being excavated by H. C. Lawlor between 1922 and 1924, with the resulting finds now kept in the Ulster Museum, the site has been much restored. The rectangular building yielded about 30 slate tablets bearing Celtic designs. These 'trial-pieces' are now in the Ulster Museum along with a bell and a stone with an inscription in runes also from the site. Parts of the site were excavated later, by A. C. Thomas in 1954, by D. Waterman in the 1960s and by N. Brannon in 1979 and 1982. Lawlor's work was the first extensive excavation of such a large ecclesiastical site, and his technique has been criticized by modern standards, but one of the reasons for Nendrum's importance to archaeologists is that it is still the only major site of its kind which has been the subject of published excavation reports.
The principal monastic remains which can now be seen are three concentric cashels (enclosures) of dry stone walling, but these were substantially rebuilt by Lawlor in the 1920s. The central cashel has the round tower remains, a ruined church with a sun-dial, and a graveyard. The second cashel contains what is called a 'monastic school' or workshop and other burials.
The sun-dial now seen at one corner of the ruined church was reconstructed from fragments found during the excavation of the site in 1924 and has been dated to about the year 900. One of only a few early medieval sun-dials known to exist, it takes the form of a vertical stone pillar, 190 cm high, 40 cm wide and 15 cm thick, with the dial and gnomon on one face at the top. However, because of the nature of the reconstruction, the original height of the pillar is conjectural.
An annual service is now held by at least one local parish at the monastery, on Palm Sunday 
Mahee Island is within Strangford Lough, a body of water which has been designated as an Area of Outstanding Natural Beauty. The island is approached by narrow roads and causeways leading from the A22 road south of Comber, which is the road to Downpatrick.
A cottage was built on the island in the early 20th century and is now used as a visitor centre. The island is open daily from 10 am to 6 pm between Easter and 30 September, and from 12 pm to 4 pm on Sundays from October to Easter.
- Reeves, William, 'A description of Nendrum, commonly called Mahee Island, embracing its present condition and past history', in Ulster Journal of Archaeology (second series) 8, 13–22, 58–68 (1845, reprinted 1902)
- Knox, A., A history of the county of Down: from the most remote period to the present day: including an account of its early colonization, ecclesiastical, civil, and military polity, geography,topography, antiquities and natural history (Dublin: Hodges, Foster & Co., 1875)
- Lawlor, H. C., The monastery of Saint Mochaoi of Nendrum (Belfast Natural History and Philosophical Society, 1925)
- Fitzsimons, E. M., Mochae of Nendrum and his cult (unpublished M.Phil thesis, Queen’s University of Belfast, 2000)
- Macdonald, P., Excavations at Mahee Castle, Co. Down CAF Data Structure Report No. 11 (Centre for Archaeological Fieldwork, Queen’s University Belfast, 2003)
- Matthews, G. Nendrum rediscovered (unpublished undergraduate thesis, Queen’s University of Belfast, 1995)
- McErlean, T., and Crothers, N., 'The Early Medieval tide mills at Nendrum, an interim statement', in McErlean, T., McConkey, R., and Forsythe, W., Strangford Lough. An archaeological survey of the maritime cultural landscape (Northern Ireland Archaeol. Mono. No. 6) (Blackstaff Press Limited and Environment and Heritage Service, Belfast, 2002)
- Baoill, R., and McQuaid, Y., Mahee Castle (unpublished excavation summary report, Belfast, 2002)
- ↑ 1.0 1.1 1.2 Halpin, Andrew, & Conor Newman, Ireland: An Oxford Archaeological Guide to Sites from Earliest Times to AD 1600 (Oxford University Press, 2006, ISBN 0192806718, ISBN 978-0192806710), pp. 99-100 at books.google.com
- ↑ 2.0 2.1 2.2 2.3 2.4 Macdonald, Philip, of Centre for Archaeological Fieldwork, Queen's University, Belfast, Monitoring at Nendrum, Mahee Island, Co. Down 2003 at qub.ac.uk (pdf file)
- ↑ Industrial Heritage Association of Ireland Newsletter May 2008 at ihai.ie
- ↑ McErlean, Tom, & Norman Crothers, Harnessing the Tides: the Early Medieval Tide Mills at Nendrum Monastery, Strangford Lough (The Stationery Office, 2007)
- ↑ Nendrum, County Down at bbc.co.uk
- ↑ Reeves, William, Ecclesiastical Antiquities of Down, Connor, and Dromore (1847), p. 148 online at books.google.com
- ↑ 7.0 7.1 7.2 Reeves, op. cit., p. 150 at books.google.com
- ↑ 8.0 8.1 8.2 8.3 Nendrum Monastery at theoldschoolhouseinn.com
- ↑ Weir, A (1980). Early Ireland. A Field Guide. Belfast: Blackstaff Press. p. 137.
- ↑ Edwards, Nancy, The Archaeology of Early Medieval Ireland (Routledge, 2007 ISBN 0415220009, ISBN 978-0415220002) p. 101 at books.google.com
- ↑ 11.0 11.1 The County Down sundial trail at sundials.co.uk
- ↑ photograph of Nendrum Dial at flickr.com
- ↑ http://stmaryscomber.org.uk/photos/?g2_itemId=25
- ↑ Nendrum Monastic Site at discovernorthernireland.com
|Wikimedia Commons has media related to: Nendrum Monastery|
- Virtual tour of Nendrum monastery — at virtualvisit-northernireland.com
- Monitoring at Nendrum, Mahee Island, Co. Down 2003 — at qub.ac.uk (pdf file)
- Nendrum, County Down, media clip — at bbc.co.uk
- The Ghosts of Nendrum, Mobile Learning — at bbc.co.uk