Sinn Féin's Martin McGuinness has died aged 66
NI's former deputy first minister died in hospital with his family by his side
Ex-IRA leader turned peacemaker worked at the heart of the power-sharing government
He became deputy first minister in 2007, working with DUP leaders Ian Paisley, Peter Robinson and Arlene Foster
Politicians and the public have been reacting to his death
Arlene Foster speaks at Stormont after hearing of the news of Martin McGuinness' death earlier this morning - watch her interview below.
DUP's Arlene Foster pays tribute to Martin McGuinness
Former British prime minister Sir John Major said Martin McGuinness had "a lot of blood on his hands" in the earlier part of his life - but later played an "important part" in the peace process.
Sir John, who issued the 1993 Joint Declaration that was an important step towards peace, told BBC News that Mr McGuinness' IRA involvement was "unforgivable".
"I cannot find any redeeming quality in what he did over those years," he said.
But he added: "I do recognise the part he subsequently played in building a peace process".
Allow X content?
This article contains content provided by X. We ask for your permission before anything is loaded, as they may be using cookies and other technologies. You may want to read X’s cookie policy, external and privacy policy, external before accepting. To view this content choose ‘accept and continue’.
The DUP leader and former first minister Arlene Foster, who worked in government with Mr McGuinness said they both shared a "deep desire" to see the devolved institutions working".
The director of Northern Ireland's Evangelical Alliance, Peter Lynas, says he met Martin McGuinness a number of times and he often talked about his relationship with Ian Paisley (both pictured below), his own faith and "desire for reconciliation".
Image source, Pacemaker"It is well known that the two prayed together and discussed faith," he says.
"Martin always seems to have struggled with his own violent past, but he also took the republican movement on a journey away from violence."
Allow X content?
This article contains content provided by X. We ask for your permission before anything is loaded, as they may be using cookies and other technologies. You may want to read X’s cookie policy, external and privacy policy, external before accepting. To view this content choose ‘accept and continue’.
The Queen is sending a private message to Martin McGuinness's widow, Bernie.
Image source, Press AssociationMcGuinness met the Queen during her two-day visit to Northern Ireland in 2012 and famously shook her hand.
Enda McClafferty
Political correspondent
"Bogside republicans never retire," a defiant, but tearful, Martin McGuinness told his supporters on the night he called time on his political career.
McGuinness was surrounded by family and friends outside his home in the area of Derry where he had spent most of his life - three streets away from where he was born. His roots were in the Bogside as was his final public appearance.
The leader of the Irish opposition, Fianna Fáil's Micheál Martin, said Martin McGuinness" embraced the peace process with a generosity of spirit that won people over".
Image source, PA"As a man, he possessed great humility, and was very personable," he said. "His work in the peace process will undoubtedly inspire others to follow his legacy in continuing to build stronger bridges between both traditions on this island."
Image source, PacemakerAn IRA bomb killed nine innocent people and one of the bombers when it exploded on the Shankill Road in north Belfast
Martin McGuinness lived a life of two halves. Those who lost loved ones or were injured in the IRA's bombing campaigns harbour painful memories.
But some say the pain has been soothed by Mr McGuinness' recent legacy and his willingness to compromise for peace in Northern Ireland.
"Martin McGuinness' fingerprints were all over the Troubles, but they were also all over the peace process," says Alan McBride, whose wife, Sharon, died in the Shankill bomb, in Belfast, in 1993.
Others who suffered at the hands of the IRA were less forgiving.
Read about the victims and how they are reacting to today's news.
The head of the Northern Ireland Civil Service, Sir Malcolm McKibbin, described Martin McGuinness as "tireless in his efforts" to improve devolution.
He said his loss will be "acutely felt by his support staff who worked closely with him here in Stormont Castle". Sir Malcolm added: "Martin was hugely appreciative of all their efforts and regardless of what was in the diary for the day, Martin always made time for them."
Allow X content?
This article contains content provided by X. We ask for your permission before anything is loaded, as they may be using cookies and other technologies. You may want to read X’s cookie policy, external and privacy policy, external before accepting. To view this content choose ‘accept and continue’.
Victoria Derbyshire
Lord Tebbit, whose wife was left paralysed after the IRA bombing of Brighton's Grand Hotel in 1984, says Martin McGuinness saw the peace process as a way of escaping justice.
He says he can't be forgiven because he hasn't repented, and said his wife had experienced pain every day since the bomb.
Lord Tebbit: Martin McGuinness was 'a coward'
Allow X content?
This article contains content provided by X. We ask for your permission before anything is loaded, as they may be using cookies and other technologies. You may want to read X’s cookie policy, external and privacy policy, external before accepting. To view this content choose ‘accept and continue’.
John Hume, who won the Nobel Prize for his role in the Northern Ireland peace process, says Martin McGuinness left an "indelible print on politics in Ireland".
In a joint statement with his wife Pat (both pictured above), he says their "starting points on the approach to finding a solution to the divisions on this island were very different" but that he was "very committed to the agreed Ireland of the Good Friday Agreement".
"He played a very important role in our peace process and his courageous, generous and gracious gestures as deputy first minister were offered in a spirit of reconciliation and peace building."
The Church of Ireland primate has said Martin McGuinness lived a life of "two very distinct halves, and most of us have great difficulty in connecting the two".
Image source, PacemakerIn a statement, the Most Revd Dr Richard Clarke , external added that "while recognising the hurt, fear and misery brought into hundreds of other lives in the first part of that life, we should also convey proper appreciation of the immense statesmanlike qualities that Martin McGuinness brought into the political life of Northern Ireland in recent years".
Jo Berry was 27 when her father was killed in an IRA bomb in Brighton's Grand Hotel in 1984.
Her father, the Conservative MP Sir Anthony Berry, was among the five who died when an explosion ripped through the hotel during the Conservative Party conference.
Speaking to the BBC, she recalls how she felt at the time.
"Within a couple of days it was important for me to find something positive in it.
Image source, PAJo Berry and Patrick Magee promote peace and reconciliation, pictured in 2004
"Martin McGuinness’ work was absolutely essential in securing peace. It’s because people like him have sat down with their enemies that we have peace today," she added.
She has since set up a peace charity, external with Patrick Magee, who was convicted of planting the Brighton bomb.
Allow X content?
This article contains content provided by X. We ask for your permission before anything is loaded, as they may be using cookies and other technologies. You may want to read X’s cookie policy, external and privacy policy, external before accepting. To view this content choose ‘accept and continue’.
The Catholic Primate of Ireland, Archbishop Eamon Martin, has described Martin McGuinness as one of the "key architects" of the peace process and a "man of prayer".
"I will remember Martin as someone who chose personally to leave behind the path of violence and to walk instead along the more challenging path of peace and reconciliation.
"As a leader he was courageous and took risks in order to bring others with him, convincing them that goals could be achieved by politics and persuasion," the archbishop's statement , external said.
Allow X content?
This article contains content provided by X. We ask for your permission before anything is loaded, as they may be using cookies and other technologies. You may want to read X’s cookie policy, external and privacy policy, external before accepting. To view this content choose ‘accept and continue’.