On 22 June 1921, the Parliament of Northern Ireland was officially opened in Belfast. This significant constitutional development followed the enactment of the Government of Ireland Act 1920, which sought to address the complex political landscape of the period by providing for the partition of the island into two separate jurisdictions, each with its own devolved administration.

The establishment of this parliament marked a pivotal moment in the political settlement of partition, creating a new framework for governance within the region. By formalising the existence of a devolved government, the opening ceremony served as a cornerstone for the administrative and political structure of Northern Ireland during the interwar years.

• The parliament was established under the Government of Ireland Act 1920.
• The official opening ceremony took place in Belfast on 22 June 1921.
• This event formalised the creation of a devolved government for Northern Ireland.
• The institution became central to the political settlement following partition.