Grianán of Aileach

Standing on the summit of Greenan Mountain, the great stone fort known as the Grianán of Aileach commands spectacular views across Inishowen between Loughs Foyle and Swilly, west towards Letterkenny and east towards Derry where St Colum Cille’s foundation was the ecclesiastical powerhouse of the region. It has been suggested that the fort was originally constructed sometime before AD800 by the ...