A sign that used to be at the cemetery read:

"Old Catholic Cemetery
"Burial ground of the Roscommon Irish who settled in the village of Lansingburgh in the early 1800's. Immigrants who fled from persecution to establish homes in America. By hard work and industry they left their mark in the building of a new nation under freedom and liberty."

Another website, possibly on the basis of that old sign, calls this cemetery the "Old Catholic aka Roscommons Cemetery."

Headstones which could be read name the following counties of Ireland: Cavan, Cork, Kilkenny, Limerick, Longford, Offaly, Sligo, Tipperary, Waterford, Westmeath, and Wexford and counties of Northern Ireland: Antrim, Fermanagh, Londonderry, and Tyrone. County Roscommon isn't represented on stones that can currently be read, curiously, though some Rensselaer County Naturalization Declarations of the late 1840s and 1850s do identify that county as the origin for some people residing in Troy, Cohoes, Albany County, Saratoga County, etc. Perhaps the Roscommon Irish didn't name their home on their headstones, or those headstones are illegible, buried, or missing, or perhaps they lacked headstones (or the old sign might have been mistaken).

"The Old Catholic Cemetery, 107th Street and Third Avenue, was rededicated Sunday afternoon in ceremony which paid tribute to the pioneer Irish Catholics who helped found the church in the area.
"T.M. Guerin Jr., principal speaker for the ceremonies, said no slight was intended to Catholics of other nationalities, ‘but the fact is that the vast majority of the early Catholics of this particular area were natives or the sons and daughters of natives of Ireland.'
"In the cemetery, originally designated about 1829, many of the original headstones can still be read.
[...]
"Guerin said in later years the immigration increased with ‘the children of many of them working from dawn to night in the mills of this very area, all with the hopes of keeping their families together.'
"Guerin closed his remarks by saying the Irish suffered many hardships, both at home and in this country, but through it all, they always gave thanks and continued to look to Christ.
[...]
"Dignitaries Present
"Dignitaries present for the ceremonies included Assemblymen Neil W. Kelleher, Councilman [Edward J. Connally, County Legislator Frank P. McDonald and former State Sen. F. Warren Travers."
[...]
Scruton, Bruce. "Burgh Cemetery Ceremony Recalls Irish Pioneers." Times Record. June 21, 1971: 14 cols 1-2.


"located at the south east corner of the present third avenue and 107th Street, across the street from and just south of the village cemetery. In 1829 when this cemetery was purchased this location would have been described as congress and mill streets. This cemetery was opened in 1829, on land purchased by Keating Rawson an outstanding early Lansingburgh Catholic layman, the first burial being that of his wife Ann. He deeded the cemetery ground to 'the Catholic Church of Lansingburgh', later St. John's and still later called St. Augustine's church, for a consideration of $140 he purchased lots nos. 114, 115, 116, 162, 163 and 164 from Philander Wells and Elizabeth, his wife."
Broderick, Frances D. The Burial Grounds of Lansingburgh, Rensselaer County, New York. Lansingburgh, NY: Frances D. Broderick, 1965.

"A curious thing about the burying ground is that nearly every stone bears within its inscription the words 'A native of Ireland.' When studying the names and the epitaphs one is impressed by a number of different things. The first by the thought that all these people were in a strange country when death, with his icy hand on their brows, transported them to other regions. Almost without exception these who were laid low were emigrants from the Emerald Isle. No doubt, many of them had hardly seen the new country before they had passed out of life: they had come here with aspirations which they hoped to realize; America was to them the Mecca of their hopes; it meant peace and plenty for them, and Troy, busy eve in those early days, seemed to offer every hope for the future. What hopes must have been crushed when one by one these friends and neighbors passed away from mortal ken. Another striking thing is that many, indeed, of the deaths were recorded in the thirties, mostly the year 1838, and still another remarkable thing is that many of the inscriptions on the gravestones show that those buried were young, many having succumbed to the Death Angel in their early twenties."
"A Bit of Ireland; Graves of Emigrants From the Emerald Isle Obscured and Forgotten; An Aged Resting Place Where the Head Stones Are Decayed and Fallen—Curious Epitaphs Some of Which are Still Legible to the Reader." Troy Northern Budget. October 21, 1906: 8 cols 1-2.


"The Catholic Burial Ground, near the Lansingburgh road, is the oldest in this section of country. Forty years ago, the ground belonged to the estate of Keating Rawson, of Lansingburgh. He sold off burial plots enough to remunerate him, and when he died his heirs let the property pass to those who had taken lots. There are representatives of but few families interested in the ground remaining here to look after it. A result is that it has been neglected and the fence become rotten or broken down. Recently, Messrs. Tracy, of Lansingburgh, McKeon, of this city, and others, have taken hold of the matter, commenced a subscription and the erection of a new fence. To make the work complete and creditable, additional subscriptions are necessary; and it is desirable, also, that such as have subscribed should hand the amount over to either Peter Finnerty, James McKeon, D. Ganley or Mat. Higgins, of this city, or Mr. Conners, marketman, at Lansingburgh."
"Home Matters." Troy Daily Times. September 5, 1865: 3 col 2.