The Good Friday Agreement is being commemorated in a series of events in April to mark its 25th anniversary.
It largely brought to an end the three decades of violence known as the Troubles and has played a significant role in shaping Northern Ireland since then.
The agreement led to a new system of devolved government on the basis of power-sharing between unionists and nationalists through the Stormont Assembly and Executive.
Read more: Stormont instability a lingering regret from Good Friday Agreement, says Bertie Ahern
It also created new institutions between Northern Ireland and the Irish Republic, and between the Republic and the UK.
The Good Friday Agreement was signed on April 10 1998.
It followed intensive talks between most of Northern Ireland's political parties and the British and Irish governments, with a US special envoy chairing discussions.
The agreement was backed by voters in referendums held in both Northern Ireland and the Irish Republic on May 22 1998.
In Northern Ireland 71% of voters backed the deal, while in the Republic the figure was 94%.
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