[2] The earliest surviving reference to the name is for the year 1475 in the 'Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 13, 1471-1484', where it is spelled Kylldallan.
John Colgan's 1645 book Acta Sanctorum Hiberniae, under 29 January, spells the name as Ecclesia Killdallanensi and Kill-Dallain.
The church was traditionally founded by the Ollamh Érenn or Chief Poet of Ireland, Dallán Forgaill at the end of the 6th century.
The 'Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 13, 1471-1484', on 18 November 1475 states- To the archdeacon of Kilmore, Nemeas Odrom (O’Drum), a canon of the same, and the official of the same.
The pope has been informed by Bernard Offayrchellaic (O’Farrelly), priest of the diocese of Kilmore, that John Machiarnan (McKiernan), perpetual vicar of the parish church of Kylldallan in the said diocese, has, after being suspended from divine [offices], celebrated mass and [other] divine offices in contempt [of the Keys], and has taken part therein, thereby contracting irregularity, and has committed perjury.
For these reasons Dallan came at the summons of the heavenly intensely devout saint, and elect compassionate cleric, to Rossinver where Maedoc was, and was with him for some time while he made known his disposition and will, and divided his bells and fair bachalls, and his glorious wonder-working relics, among his churches and chief cells, and further finally made known to Dallan the tribute due to him from (various) races, just as he had related and told to Ultan of Ardbreckan, who made a poetical explanation of it, in order to compose and adorn (the account of) it at the bidding of the patron and high saint and virgin bishop, for the man Ultan was a prophet and a poet.
Church Lands An Inquisition held in Cavan Town on 20 June 1588 valued the total vicarage of Kildallon at £7.
[12] On 8 June 1595 Queen Elizabeth I of England granted to Edmond Barret, inter alia, Two pulls of land of every kind belonging to the termon or hospital of Kildallon, in the County of Cavan, commonly called the Hospital Lands.
[13] King James VI and I seized the lands in Kildallan townland belonging to the erenach of Kildallan, Sloghie O'Shanaghan, who had been attainted and on 7 November 1603, the King granted a lease for 21 years of, inter alia, The fearme of the termon of Kildallon containing twoe pooles of land to Sir Thomas Ash of Trim, County Meath.
By grant dated 10 August 1607, along with other lands, King James VI and I granted a lease of the lands of Killadallan containing 2 pulls for 21 years at an annual rent of £0-6s-6d to the aforesaid Sir Garret Moore, 1st Viscount Moore of Mellifont Abbey, County Louth.
By a deed dated 6 April 1612, Robert Draper, the Anglican Bishop of Kilmore and Ardagh granted a joint lease of 60 years over the termons or herenachs of, inter alia, 2 polls in Kildallan to Oliver Lambart, 1st Lord Lambart, Baron of Cavan, of Kilbeggan, County Westmeath and Sir Garret Moore, 1st Viscount Moore, of Mellifont Abbey, County Louth.
By deed dated 17 July 1639, William Bedell, the Anglican Bishop of Kilmore, extended the above lease of 2 pooles in Killdallan to Oliver Lambert's son, Charles Lambart, 1st Earl of Cavan.
An Inquisition held in Cavan town on 25 September 1609 stated that The bishop of Kilmore was entitled to an annual rent of one mark from the two polls of the termon of Kildallan and that there are two ballybetaghs and fifteen polls in the parish of Kildalan and that the parsonage thereof is impropriate to the abbey of Drumlahan and the vicarage is collative and the tithes are paid in kind, one third part to the vicar and the other two third part were paid to Drumlahan but now belong to the bishop of Kilmore.
[17] At Cavan on 21 June 1643, Henry Baxter gave the name of a rebel leader as Hugh Brady of kildallon.
[18] Edward Cooper and his brother John, both of Kildallon, were robbed by Hugh Brady of the parish of Kildallon of the County of Cauan & Brian mc Carnan & Cormock Brady & Knoghor mc Anaboigh of the same parish.
[32] Folklore about Kildallan is contained in the 1937 Dúchas collection[33] In the 1901 census of Ireland, there were twenty-seven families listed in the townland.
It was found in the townland and parish of Kildallan, barony of Tullyhunco, county of Cavan, and is one of the finest specimens of this description of weapon now in the Academy's collection.