Martin McGuinness: The reaction in quotes...
"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." Catholic Primate of All Ireland and Archbishop of Armagh Eamon Martin
"Notwithstanding our profound political differences, I always found him to be a very friendly person and easy to talk to." Former Taoiseach John Bruton
"He was very opaque and selective with the truth. With him the truth has died and that's the big problem." Julie Hambleton, sister of an IRA bombing victim
"By his actions and words over the last 25 years, he demonstrated a keen understanding of what the peace process was all about. He worked to build bridges between the different traditions and communities on the island." Fianna Fáil leader Micheál Martin
"I think the Christian view in life is how a person's journey started is of course important, but it is how it finishes which is actually more important." Ian Paisley Junior
"Nobody can expect those who lost a loved one to let go of their grief. That's human, natural and understandable, but in the end, Northern Ireland has made a decision to move forward and it was a right decision, whatever the consequences of the past." Former US senator George Mitchell
"A man that has done so much for Irish people and Irish people's freedom to the very end. He was also a good friend and someone I had the pleasure of having a good relationship with.
"A man I met so many times, had the privilege to share many a great conversation with, a man that always text me before games wishing me luck." Republic of Ireland international James McClean
"Martin was a proud Derry man and a regular attendee at our games, whether it was at Celtic Park, other venues across Ulster or indeed around Ireland, including of course Croke Park. [That] he worked tirelessly in recent decades for the betterment of all and the improvement to life on this island over that time, most notably in the North, is testament to his efforts. His influence and charisma will be sorely missed." GAA president Aogán Ó Fearghail
"Martin set the bar very high. He set the bar very high in his style of leadership. He stepped outside his comfort zone time and time again because he knew it was the right thing to do." Sinn Féin's Michelle O'Neill
"If he had been repentant my thoughts might have been slightly different. But he took to his grave proud that he served in the IRA. There was no remorse or repentance from him even up to his death." Stephen Gault, son of Enniskillen bomb victim
"Once he became the peace maker he became it wholeheartedly." Former British prime minister Tony Blair
"For too many years, too many people lost their lives over the Troubles in Northern Ireland. Martin McGuinness realised that. If one wishes to secure long-term peace - negotiation must always prevail over violence. In a mixed legacy, that stands to his credit. Let that be his epitaph." Former British prime minister John Major