A large quantity of deposited public records in Ireland were destroyed in a fire in Dublin in 1922. For the genealogist, this meant the loss of 19th-century census returns, Church of Ireland parish registers, wills and legal records.
Some documents survived this destruction. These include civil registration records (introduced from 1845), some later census returns, Church of Ireland parish registers that had not been deposited, Catholic and nonconformist registers, and will indexes. For an ambitious initiative to establish a virtual record office from what remains or can be replicated, see https://beyond2022.ie.
For Irish records on this site, see the list at Ireland.