John Regan, 1851 Census

Most census records for Ireland prior to 1901 were destroyed in a fire during the Civil War, 1920s. (The scheduled 1921 census did not occur until 1926 because of this). Worse, some of them were just destroyed because they were deemed not needed. See:

https://www.irish-genealogy-toolkit.com/irish-census-fragments.html

https://www.irish-genealogy-toolkit.com/1861-1891-irish-census.html

This isn't the straight census record! It is evidence that a search was made against the record when it still existed! See:

https://censussearchforms.nationalarchives.ie/search/cs/home.jsp

To search: 

https://censussearchforms.nationalarchives.ie/search/cs/index.jsp

Here we find John Regan, of Cashelcolaun in the 1851 extract. So some time after 1908, John applied for a pension and to prove his age he referred to his parents who had been part of the 1851 census. This form was used to track whether that was true (should have been rejected if NOT true).

https://censussearchforms.nationalarchives.ie/reels/c19/007246695/007246695_01305.pdf

Note the address at the top is for the landowner, the bottom address where John lived.

There are 4 Martin Regans (!) in Cashelcolaun in 1851 according to Griffiths, but only one John! But Griffith's only lists leaseholders, so there could have been other Johns.

If this is the right John, Martin and Honoria would be Grandma Katherine Regan's gr-grandparents.