Indicated

Situated at the S end of a low NNW-SSE ridge in a low-lying landscape. This is a subcircular grass-covered area (dims 48m NW-SE; 41m NE-SW) defined by an earthen bank (Wth 6-7.7m; int. H 0.6-0.8m; ext. H 3.2-3.8m) with traces of external facing-stones separated by a rounded fosse (Wth of top 9.8-11m; Wth of base 2-3m; D 1.8-2m) from an outer overgrown bank (Wth of base 6-6.2m; Wth of top 1m; H 0.8m) which is incorporated into a road bank NE-SE. The entrance (Wth 3.3m) and causeway (Wth 3m) are at NNE (max. ext. diam. 73m NW-SE). The late 16th or early 17th century house (RO051-047001-) is in the interior. It has been interpreted as a possible ringwork castle (Graham 1988, 28-9; Sweetman 1999, 197), and has been identified as the castle of Onagh that was built in 1236 and destroyed by Áedh O'Conor in 1270 (Curley 2011, 40-1; 2016). It has also been interpreted as a rath that was re-fortified when the house (RO051-047001-) was built (O'Conor 2007, 191-2). Compiled by: Michael Moore Date of revised upload: 8 January 2015

Dundonnell is a hillfort likely dating to the Iron Age, constructed as a defensive or territorial site. Its strategic position on a ridge suggests it was important for local control and communication in the prehistoric landscape.