In 1575, during the
Tudor conquest of Ireland, the English built a fort at what is now Blackwatertown, to control this important river crossing in the heart of
Gaelic Ulster. Most of the fort was on the eastern bank of the river, and there was a stone tower on the western bank. In February 1595, at the outset of the
Nine Years' War, a Gaelic force led by
Art MacBaron O'Neill assaulted and captured the fort from the English. This fort is referenced in the village's Irish name,
An Port Mór ("the great fort"). The wider
townland is also called Lisbofin, from
Lios Bó Finne meaning "fort of the white cow", which may refer to one of the
ringforts in the area. Blackwatertown was one of the first places in Northern Ireland to erect street signs in the Irish language in 1980. The village recently had signs erected at the entrances indicating its name; previously signs were erected by local individuals indicating its name in the Irish == Education ==