Castleblayney (in modern times given the name of Baile na Lorgan in Irish, but onetime alternatively known as Caislean Mathghamhna), is a former market town and, since 1922, a Border town in mid- or south-east County Monaghan, its current population being ca. 3000 people, with another 8000 in the suburban and rural environs. Among the nine counties of the ancient province of Ulster, Monaghan is one of the three that are located in the modern Republic of Ireland. Castleblayney is on the N2 National Primary Route from Dublin to Derry, near the border with Co. Armagh, Northern Ireland.