August 1, 1851The Ecclesiastical Titles Act forbids Catholic bishops to assume ecclesiastical titles taken from any place in the United Kingdom
March 30, 1851A 1851 census shows the population of Ireland to be 6,552,385, it has declined by one-fifth since 1845
January 24, 1851Charles Plummer, Irish language scholar and editor of Lives of the Irish Saints, is born
November 17, 1852Donegal-born Brigadier Michael Corcorans Irish Legion is mustered into the Federal service