Agharaskilly (from Irish Achadh Ros Cille, meaning 'Field of the Church's Wood') is a townland in the civil parish of Tomregan, County Cavan, Ireland.

[8] A sub-division of the townland is Derryliffe which is an anglicisation of the Gaelic placename Doire Life, meaning "The Oak-Wood of Liffey".

Its chief geographical features are the Shannon–Erne Waterway, which flows north along the western boundary of the townland, and several small drumlin hills reaching to 200 feet (61 m) above sea-level.

Bedell petitioned Lord Viscount Falkland, the Lord Deputy of Ireland in August 1629 as follows:Sir Edward Bagshaw, Knight, since the death of the late bishop, in the vacancy of the said sees hath entered upon two poles of land called Agarosikilly, parcel of the Termon of the see of Kilmore, whereof your petitioner's predecessor died seised.

Your Petitioner humbly prayeth that he may be restored to the possession of the said lands enjoyed by his predecessor, and kept in the same, till the said Sir Edward Bagshaw shall show reason to the contrary to this Board.

[12] On 19 September 1643, James Gardiner of Aghabane gave the following deposition about the Irish Rebellion of 1641 in Cavan: James Gardiner late of Taghabane in the parrish of Kildallan in the County of Cavan, gent and tanner, sworne and examined sayth that in the beginning of the present Rebellion he this deponent at Taghabane aforesaid and alsoe at Correnery in the Parrish of Killasandra & County of Cavan was deprived robbed or otherwise dispoyled of his goodes & chattells consisting of horses, Mares a Coult beasts, Cattle, sheepe, corne, Malt, howshold goods provition, his stock in his tannhowse in Killisandra & of the possession Rents and proffitts of 2 farmes.

And this deponent is like to be deprived of and lose the future profits of his said farmes (worth £20 per annum) until a peace be established: And further saith that the persons that so deprived & despoiled him of his said goods were actors in the present Rebellion and are named as followeth vizt.- Connor O’Rely of Aghroskilly in the same County, gentleman; John Mac Mulmore Rely of Killicrannah in the same County, gent; Gillernew McGaverran of Talloghagh, gente, and Charles Mc Gaverran of the same, gent; Keire O’Rourke of - in the County of Leitrim, gent; Myles O’Rely, then high sherriff of the said County of Cavan; Ferrall Mac Call O’Rely of Cashell in the same County of Cavan, gent, & divers others whose names he knows not, being their souldjers, Complicees and assistants.

[13]Henry Baxter (the son of Martin Baxter, the first Protestant Vicar of Kildallan & Tomregan) also gave a deposition about the same O'Reillys: This deponent further sayth that Knogher Mac Farrell Oge O'Rely of Tomragin in the Barrony of Talloghknohoe, gentleman; Phillip Mac Farrell Oge, his brother; Laughlin McEnrow of BallymacEnrow, yeoman, all of the County of Cavan; Hugh Brady of Kildallon in the same County, gentleman; Turlogh Maergagh Ó Rely of Tomasin of the Barrony of Loughty & parrish of Lowghty, gent, were the Rebells that soe robbed and dispoyled him of his goods.

[16] The Gwyllym estate was sold for £8,000 in 1724 to Colonel Alexander Montgomery (1686–1729) of Convoy House, County Donegal, M.P.

In 1856 they sold the estate to take advantage of its increased value owing to the opening of the Woodford Canal through the town in the same year.

The estate, including Agharaskilly, was split up among different purchasers and maps & details of previous leases of the sold parts are still available.

[20] The Tithe Applotment Books for 1827 list the following tithepayers in the townland- Reilly, Kernan, Donahey, Fitzpatrick, McKernan, Benison, Taylor, Browne, Jones, Sturdy, Cox.

[21] The Ordnance Survey Name Books for 1836 give the following description of the townland- Achadh chroise coille, 'field of the cross of the wood'.

[22][23][24] Griffith's Valuation of 1857 lists the landlords of the townland as representatives of William Enery, Seaton, McAdam, Donohoe, Cox and Jones and the tenants as Benson, Enery, Kiernan, Reilly, Fitzpatrick, McAdam, Donohoe, Cox, Hunt, Flanagan, Maguire, Kane, Reilly, Gregory, Latimer and Jones.