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In depth
The GRO (General Register Office) is the Irish government office that maintains records of births, deaths, marriages, and civil partnerships in the Republic of Ireland. The GRO is based in Roscommon and is the primary source of Irish vital records for FBR applications.
For FBR applications, the GRO provides the Irish-born grandparent's birth certificate (long-form), the parent's birth certificate (if born in Ireland), and marriage certificates. All documents must be certified copies.
The equivalent office in Northern Ireland is the General Register Office Northern Ireland (GRONI), based in Belfast. Records from GRONI are equally valid for FBR applications under the Good Friday Agreement.
Related terms
The Foreign Births Register (FBR) is the official record maintained by Ireland's Department of Foreign Affairs of people born outside Ireland who are entitled to Irish citizenship by descent.
GRONI (General Register Office Northern Ireland) is the government office that maintains vital records for Northern Ireland, equivalent to the GRO in the Republic.
The grandparent rule is the most common path to Irish citizenship by descent: having one grandparent born on the island of Ireland (including Northern Ireland) qualifies you for the Foreign Births Register.
The Good Friday Agreement (1998) is the peace accord that confirms the right of people in Northern Ireland to identify as Irish, British, or both, and to hold citizenship accordingly.
The Irish Nationality and Citizenship Act 1956, as amended, is the principal Irish citizenship law that governs the Foreign Births Register and other paths to Irish citizenship.
A post-nuptial declaration is a historic Irish citizenship path for foreign spouses who married Irish citizens before certain dates, allowing them to claim Irish citizenship through marriage.