The Taoiseach has said all those who negotiated the Good Friday Agreement 10 years ago are very proud of it today.
Bertie Ahern said it had proved very successful for Northern Ireland and he hoped Northern Ireland would now go from strength to strength.
Mr Ahern was speaking in Belfast after attending a conference involving many of those who took part in the 1998 peace negotiations.
Meanwhile the head of the group given the task of securing paramilitary disarmament said he hoped loyalist groups would engage with them properly.
General John de Chastelain expressed disappointment that the Ulster Defence Association and the Ulster Volunteer Force had not followed the same decommissioning process as the IRA.
However he hoped ongoing contact between the Independent International Commission on Decommissioning with them would eventually bear fruit.
Conference marks GFA anniversary
At the conference the Taoiseach was joined by Sinn Féin's Gerry Adams and Martin McGuinness along with SDLP leader Mark Durkan and his predecessor John Hume.
Sir Reg Empey represented the Ulster Unionists. But former British Prime Minister Tony Blair and former US President Bill Clinton were not present.
First Minister and DUP leader Ian Paisley, who was not a signatory, was also absent.
He is visiting the US in advance of next month's economic conference.
Senator George Mitchell, who chaired the talks and helped the parties find a compromise over the controversial issue of decommissioning, attended.
Speaking before the event, the Taoiseach said he was delighted to be spending today in Belfast.
He said that 10 years on from Good Friday 1998 the city is now a vibrant, modern and peaceful place that is looking forward to the future with confidence.
Click here to watch news programmes from Good Friday 1998