In a beautiful setting with excellent views of the Mourne Mountains and Carlingford Lough, Greencastle is mainly 13th-century in date. It was built at royal expense and guarded the southern approach to the Anglo-Norman Earldom of Ulster.
After capturing the town of Carrickfergus in 1315/16, a Scottish army under Edward Bruce headed to the important town of Dundalk, one of the seats of Anglo-Norman power in Ireland. It was also a source of much-needed supplies. The Scottish force marched south, wreaking havoc on the Anglo-Norman Earldom of Ulster. It is likely that the settlements at Dundonald, Downpatrick and Dundrum were razed at this time, with Greencastle captured by the Scottish army of Edward Bruce and a garrison was placed in it under the command of Robert de Coulrath.
It was afterwards retaken by the Anglo-Normans.
Even after the ignominious end to the campaign in 1318, Edward’s brother Robert Bruce continued to maintain an interest in Ireland, even visiting the island on at least two occasions near the end of his life. It is known that in 1327 he visited Glendun on the east coast of County Antrim, and landed at Larne the following year. In 1328 he proposed holding a meeting at Greencastle in County Down to agree a peace treaty between the English and the Scots.
The castle continued to be used until the 1600s. It is now in state care. The most substantial part of the castle to survive is the rectangular keep. Only portions of the surrounding curtain wall remain. The ditch around the curtain wall was cut from rock.
References:Střekov Castle (Schreckenstein) is perched atop a cliff above the River Elbe, near the city of Ústí nad Labem. It was built in 1316 for John of Luxembourg, the father of the Holy Roman Emperor Charles IV, to guard an important trade route to Germany. After changing hands several times, the castle was acquired by the Lobkowicz family in 1563. Its strategic importance led to occupations by Imperial Habsburg, Saxon, and Swedish forces during the Thirty Years' War, as well as successive sieges by Austrian and Prussian armies during the Seven Years' War.
Although Střekov Castle was heavily damaged during those conflicts and abandoned as a military installation by the end of the 18th century, the 1800s saw many poets and artists visiting the castle, drawn by a new trend of interest in romantic ruins.