Greaghrahan is a townland in the civil parish of Drumlane, Barony of Loughtee Lower, County Cavan, Ireland.

The 1609 Ulster Plantation map of the Barony of Loughtee shows it as forming one of the two polls contained in Ballyhugh townland, which is spelled Belloghea.

Its chief geographical features are Aghavoher Lough,[6] Dungummin Lough alias Dungimmon Lake,[7] Killywilly Lough,[8] which lakes contain a wide variety of coarse fish and trout, the Rag River, a rivulet, stone quarries, woods & plantations, a drumlin hill which reaches a height of 233 feet above sea-level, a spring well and a dug well.

[9] An Ulster Plantation grant of the 'Manor of Monaghan', dated 21 June 1610, from King James VI and I to Sir Hugh Wyrral, a native of Enfield, Essex, England, included the two polls of Bellaghea.

[11] Bagshaw's daughter, Anne, married Thomas Richardson of Dublin, son of John Richardson, bishop of Ardagh, and the marriage settlement dated 28 May 1654 transferred the estate to the married couple.

On 30 April 1661 the Richardsons sold part of the estate, including one poll of Greaghrane, to Captain Ambrose Bedell of Carn, Tullyhunco, County Cavan.

The school had two rooms which contained a series of long wooden desks with blackboards on easels at each end.

The children learned English and Irish reading, Spellings, Poetry, History, Geography and Catechism.

The Reports from the Commissioners of National Education in Ireland give the following figures for Greaghrahan School, Roll No.