‘The history of Mourne is associated with that of the Castle of Greencastle – one of the finest specimens of Anglo-Norman architecture military architecture in the County of Down – which constitutes such an important feature in the scenery of that coast, from every point of which it presents a noble and commanding appearance. It was erected by the early English invaders to guard the entrance to the Lough of Carlingford and to secure a line of correspondence between the Pale and their outlying possessions in Lecale.’
From An Historical Account of the Diocese of Down and Connor by the Rev. James O’Laverty (Dublin, 1878)

‘Greencastle, situated in the barony of Mourne, County Down, province of Ulster. It stands upon a gut or inlet of the sea and was reputed a strong castle, fortified by the Burghs, earls of Ulster and lords of Connaught. It was remarkable for two eminent marriages celebrated here in 1312; one between Maurice Fitzthomas and Catherine, daughter to the Earl of Ulster, on the 5th of August, and the other between Thomas Fitz-John and another daughter of the said earl, on the 16th of the same month. It was destroyed by the Irish, A.D. 1643, but soon after repaired and better fortified. Green Castle and the Castle of Carlingford, appear by a record, 1 Henry IV, to have been governed by one constable, the better to secure a communication between the English pale of the County Louth and the settlements of the English in Lecale and those northern parts; and Stephen Gernon was constable of both, for which he had a salary of 20l. per annum for Green Castle and 5l. for Carlingford. In 1495, it was thought to be a place of such importance to the crown, that no person, but of English birth was declared capable of being constable of it.’
From An Improved Topographical and Historical Hibernian Gazetteer, by the Rev. H Hansbrow (Dublin, 1835)

‘The castle stands upon an elevated rock, about a quarter of a mile from the sea. The walls are double, and the outer ones is looped at regular distances for archers, with passages to each floor. The central building is strengthened and protected by four square flanking towers at the corners, with a spiral staircase in each. Upon gaining the battlements, a beautiful view of the Lough scenery is obtained; the most striking object, however, is the Castle of Carlingford, which looks to great advantage from this point.
Green Castle rendered important services in the rebellion of 1641. It served not only to protect the Protestants of the district, but exercised considerable influence in keeping the insurrection in check. A part of this old Castle is now in occupation, and the rest turned into out-offices for cattle.’
From Tours in Ulster: A Handbook to the Antiquities and Scenery by J.B. Doyle (Dublin, 1855)

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