[citation needed] From medieval times up to the early 1600s, the land belonged to the McKiernan Clan.
4d., to Bryan McKearnan, gentleman, comprising the modern-day townlands of Clontygrigny, Cornacrum, Cornahaia, Derrinlester, Dring, Drumlarah, Ardlougher and Kiltynaskellan.
In a visitation by George Carew, 1st Earl of Totnes in autumn 1611, it was recorded, McKyernan removed to his proportion and is about building a house.
[7] On 23 March 1615, Mág Tighearnán granted a lease on these lands to James Craig.
[8] On 14 March 1630, an Inquisition of King Charles I of England held in Cavan Town stated that Brian bane McKiernan died on 4 September 1622, and his lands comprising seven poles and three pottles in Clonkeen, Clontygrigny, Cornacrum, Derrinlester, Dring townland, Killygorman, Kiltynaskellan and Mullaghdoo, Cavan went to his nearest relatives.
[citation needed] After the Irish Rebellion of 1641 concluded, the rebels vacated the land and the 1652 Commonwealth Survey lists the townland as belonging to Lewis Craig.
[11] In the Cavan Poll Book of 1761, there was one person registered to vote in Clontygrigny in the Irish general election, 1761[12] - Alexander Finlay of Ardlougher.
The losing candidates were George Montgomery (MP) of Ballyconnell and Barry Maxwell, 1st Earl of Farnham.
[14] In 1832 one person in Clontygrigny was registered as a keeper of weapons- James Sewel who had one gun and one pistol.