Millions of historic personal records will be available online free of charge from today.
The records of births, marriages and deaths are being released by the General Register Office on irishgenealogy.ie.
Interested family tree researchers will have access to birth Records over 100 years, indexes to marriage records over 75 years and the Indexes to Death Records over 50 years.
They will also be able to check out transcripts of all Roman Catholic and Church of Ireland baptism, marriage and burial registers for Dublin City.
The expanded online database will be launched in the National Library of Ireland at 5.30 today.
The launch will be attended by the Grandson of Antarctic explorer Tom Crean whose records are included in the expansion.
Minister for Arts and Heritage, Heather Humphreys, and Minister for Social Protection, Leo Varadkar, will also attend.
For more information please go to www.irishgenealogy.ie