Lord Trimble pictured in 2000 with former US president Bill Clinton, as well as Seamus Mallon (SDLP) and ex-prime minister Tony Blair
Former US President Bill Clinton has paid tribute to former Northern Ireland first minister Lord Trimble, calling him a "leader of courage and vision".
And former prime minister Sir Tony Blair said without David Trimble, the Good Friday Agreement would not have been possible.
Lord Trimble died on Monday aged 77. He was instrumental in the negotiation of the 1998 Good Friday Agreement.
This was the peace deal which ended the worst of Northern Ireland's Troubles.
Lord Trimble led the Ulster Unionist Party (UUP) between 1995 and 2005.
He won the Nobel Peace Prize, along with Social Democratic and Labour Party (SDLP) leader John Hume and was the first person to serve in the role of first minister in the new Northern Ireland Executive established as part of the Good Friday Agreement.
Obituary: Lord TrimbleThe Good Friday Agreement
Lord Trimble and John Hume, who months later would be jointly awarded the Nobel Peace Prize, with Tony Blair as they began to form a government for Northern Ireland in 1998
Since 2006, Lord Trimble sat in the House of Lords.
In recent years, he was vocal in his opposition to the Northern Ireland Protocol - part of the 2019 Brexit deal that keeps Northern Ireland in the EU's single market for goods, preventing a hard border with the Republic of Ireland.
Lord Trimble argued that it put the Good Friday Agreement at risk.
David Trimble: A life in front of the camera
In a statement, President Clinton said he and his wife were "deeply saddened" by Lord Trimble's death, saying his "lifetime of service helped bring peace to Northern Ireland".
"Time after time during the negotiations that led to the Good Friday Agreement, he made the hard choices over the politically expedient ones because he believed future generations deserved to grow up free from violence and hatred.
David Trimble with his wife, Daphne, at the unveiling of a portrait of him at Queen's University in Belfast last month
Sir Jeffrey's disagreements with Lord Trimble over the Good Friday Agreement led to him quitting the UUP in 2003 and defecting to the DUP.
"Whilst our political paths parted within the Ulster Unionist Party, there can be no doubting his bravery and determination in leadership at that time," Sir Jeffrey added.