Monaghan is the county town of County Monaghan, Ireland. Its population at the 2011 census was 8,012 including suburbs and environs. The town is on the N2 road from Dublin to Derry and Letterkenny.
The Battle of Clontibret between the forces of Hugh O’Neill, The O’Neill and the English Crown was fought in northern Monaghan in May 1595. The territory of Monaghan had earlier been wrested from the control of the MacMahon sept in 1591, when the leader of the MacMahons was hanged by authority of the Dublin government; this was one of the events that led to the Nine Years War and the Tudor conquest of Ireland.
On the Hill of Lech, the Hill of the Stone was the inauguration stone of the Mac Mahons. It overlooks Ballagh Lough to the west, which was once known as Lough Leck. Situated 5 kilometres (3 miles) south-west of Monaghan, the petrosomatoglyph was last used in 1595, but was destroyed by a farm owner in 1809. It is said to be built into the wall of a mill.
The Ulster Canal through Monaghan linking the River Blackwater at Moy with the River Erne near Clones was built between 1825 and 1842. By the time it was completed, competition in the form of the Ulster Railway from Belfast to Clones was already under construction. The canal was never a commercial success and was formally abandoned in 1931.