Mourners who had flocked to Lord Trimble's funeral were urged to "redouble efforts" to restore Northern Ireland power-sharing in a fitting tribute to his life.
Prime Minister Boris Johnson and Taoiseach Micheal Martin were among those who were at Harmony Hill Presbyterian Church in Lisburn, Co Antrim, for the funeral this afternoon.
A crowd of roughly 100 people gathered outside the church to hear the service.
Nobel Peace Prize winner Lord Trimble died last week at the age of 77 following an illness.
The very Rev Dr Charles Mullan, a former Moderator of the Presbyterian Church in Ireland, said: "Can we use this service today, in a fitting tribute to one of the great, to redouble our efforts on this island home of ours?
"With courage, pragmatism and generosity of spirit, may our politicians engage wholeheartedly in resolving the outstanding issues surrounding The Northern Ireland Protocol, so that our democratic institutions are quickly restored and we can all move forward together."
The former leader of the Ulster Unionist Party played a key role in forging the 1998 Good Friday/Belfast Agreement that ended decades of conflict in Northern Ireland.
Months after the deal was signed, the peer, from Co Down, was jointly awarded the Nobel prize with late SDLP leader John Hume in recognition of their efforts to stop the bloodshed and establish a powersharing system of devolved governance in the region.
On Tuesday, the Stormont Assembly will reconvene for a special sitting to pay tribute to Lord Trimble.
The institutions are currently on ice, with the DUP blocking the creation of a powersharing administration in protest at Brexit ’s Northern Ireland Protocol.
Lord Trimble’s widow, Lady Daphne, took her place in the front row as the coffin was carried into the church by their sons and daughters.
Minister Rev Fiona Forbes told the crowd: “The array of those who have gathered today to pay their respects bears witness not only to David’s impact on the political landscape of which he was so much a part, but also to the imprints he left upon the same, and to the legacy he left all of us.
“Of course, we come to remember an academic, a party leader, a peacemaker, a Nobel laureate, the first to serve in the role of first minister in the new Northern Ireland Executive established as part of the Good Friday Agreement.
“But we also come to remember a husband, father, and grandfather, a brother, brother-in-law and uncle, a colleague, a committed member of this church family, and a friend.”
Rev Dr Charles McMullen told mourners that Lord Trimble’s actions had allowed a generation in Northern Ireland to grow up in “relative peace”.
Delivering a tribute at the service, the former moderator of the Presbyterian Church in Ireland said: “Alongside others, he rose to seemingly impossible challenges with considerable strength of character, intellectual acumen, and complete integrity.
“The reward for all of us has been a radically changed landscape here in Northern Ireland, which has saved many lives and allowed a generation to grow up in relative peace.
“As so many have said over these past few days, history will be exceedingly kind to David even if life brought many unrelenting pressures and demands.”
Dr McMullen said he hoped the funeral service could be used as an inspiration to redouble efforts to resolve political differences in Northern Ireland.
Referring to Lord Trimble’s Nobel prize speech in 1998, he told mourners: “In that speech, David made this inspiring comment: ‘The dark shadow we seem to see in the distance is not really a mountain ahead, but the shadow of the mountain behind – a shadow from the past thrown forward into our future. It is a dark sludge of historical sectarianism. We can leave it behind us if we wish. But both communities must leave it behind, because both created it’.
“It is a very powerful quotation because it reminds us of the achievements of the Good Friday Agreement in placing the principle of consent at the centre of our politics and ultimately removing the gun.
“It reminds us also that, although we are on a journey from the past, the mountain still casts a shadow and we are all, to a greater or lesser extent, recovering sectarians."
Conservative peer Lord Godson said Lord Trimble was the “most substantial figure thrown up by unionism” since the foundation of Northern Ireland in 1921.
He said: “In death he is finally being afforded the respect and love from all communities on this island that he deserves, and did not always receive in the height of his powers.”
At the end of the service the Trimble family led mourners from the church, before taking time to meet those who had attended the service.
Lord Trimble’s remains were interred later.
