When the Irish Free State was founded in 1922, the Irish language was a substantial feature of the politics that led up to this event. Subsequently the language was recognised as the national and first official language of the Irish Free State. Since then, the de jure position of Irish appears to have evolved. Most recently, legislation was introduced in the Republic of Ireland, and statutory duties were placed upon certain public bodies with regard to the Irish language in Northern Ireland. This article examines this historical shift in the status of Irish in the two political jurisdictions in Ireland, the Republic of Ireland and Northern Ireland [as a part of the United Kingdom of Great Britain and Northern Ireland (UK)], and explains its significance.