Mullaghmore, Tullyhunco (Irish derived place name, Mullach Mór meaning 'The Big Summit'.
Its chief geographical features are Mullaghmore Hill which reaches a height of 392 feet, small streams, forestry plantations and dug wells.
He was the son of the previous chief, Hugh Duff O'Sheridan of Togher townland, Kilmore parish, County Cavan.
Owen Sheridan succeeded to his father's lands and this was confirmed by a grant to him by Charles I of England dated 6 March 1637.
Owen's son Denis was born in 1612 and became a Catholic priest in charge of Kildrumferton parish, County Cavan.
sayth sworne & examined saith that on the seavententh of November last 1641 there came unto the habitacion of the deponent William Jones, [Weny] Sheridan of Molloughmore, Ffarrell mac Donell mac Ffarrell Oge McKernan of Aighavenaigh, Donell Oge McKernan of same and their nephew, which was freehoulders of the foresaid Aighavenaigh and violently with other assistants tooke away from the complayneant William Jones, fiftye English cowes price 125 li.
ster and sayd when they tooke away the foresaid goods that the said William Jones, the Complayneant, was a traytor and bade him goe for his Country England & further sayth mee And further theis deponents say that the parties mencioned in a note or scedule hereunto annexed are or were lately actors in the present Rebellion & bore and carryed armes with and for the Rebells against the Protestants whom they robbed and dispoyled of their goodes & did other outrages are theis vizt Tho: Jones Will: Jones Deposed July 26, 1642.
[9] The rest of the townland was included in a grant dated 7 July 1669 from King Charles II, to John, Lord Viscount Massareene, which included 113 acres and 24 perches of profitable land and 46 acres and 16 perches of unprofitable land in ye south part of James Thornton's retrenchments in Mullaghmore.
[10] In the Cavan Poll Book of 1761, there was one person registered to vote in Mullaghmore in the Irish general election, 1761[11] - John Coulson, Esq.
The losing candidates were George Montgomery (MP) of Ballyconnell and Barry Maxwell, 1st Earl of Farnham.