Cavan (; ) is the county seat of County Cavan in Ireland. The town lies in the northeast of the island, along the border with Northern Ireland. The N3 road connects the town to Dublin. History The O'Reilly family (still a very common surname in the area) established a castle in the town in the late 13 century. A Franciscan monastery was also established at around the same time. In the 15 century the local ruler, Bearded Owen O'Reilly, set up a market which attracted merchants from Dublin and… (More on Cavan)