When the Queen shakes the hand of Martin McGuinness in Northern Ireland it will mark a significant moment in history.
While opinion is divided over whether it's the right decision for the pair to offer the sign of peace, the Queen is certainly not the first global figure to shake McGuinness's hand.
From George Bush to Bill Clinton, Tony Blair to David Cameron - here's 31 other people who've been happy to embrace Mr McGuinness:
Would you shake hands with this man?
A shake of the hand is worth one with the Bush.
I DID shake hands with that man. Bill Clinton offers the hand of peace.
No U-turn here. David Cameron extends his charm in the direction of Mr McGuinness.
Gordon Brown manages to avoid looking too happy as he exchanges a shake with McGuinness.
Of course not. A smiling Blair seems happy to shake on it.
You can take my shake, but you can't take my freedom. Alex Salmond shakes it out.
McGuinness (left) and the Democratic Unionist Party's Ian Paisley (right) with European Comission president Jose Manuel Barroso at Stormont, Belfast.
The Fourway: A complicated mess of arms, palms and charms as McGuinness, Gordon Brown, Ian Paisley and Bertie Ahern get it on.
A classic Threeway: Conor Murphy MLA, Minister for Regional Development along with Minister for Foreign Affairs Dermot Ahern TD and Deputy First Minister Martin McGuinness after officially opening the new A1N1 Newry Dundalk Link Road
McGuinness meets Senan Walsh from Co Killkenny, during a visit to the National Ploughing Championships
Irish Presidential candidates Martin McGuinness (right) and David Norris (left) shake hands after their News at One debate.
Irish Presidential candidates Sean Gallagher (left) and Sinn Fein's Martin McGuinness bump into each other during a visit the National Ploughing Championships in Athy Co Kildare.
McGuinness and Gerry Adams (right) arrive for a press conference at the Irish Writers Museum in Dublin
McGuinness (right) shakes hands with Northern Ireland's Education Minister John O'Dowd
McGuinness greets Kerry fans on their way to the All Ireland football final
The Reverend David Latimer (left), a Londonderry Presbyterian Minister with Deputy First Minister Martin McGuinness (right) shake hands at the Waterfront Hall in Belfast.
McGuinness speaks to Lady Sylvia Hermon as Taoiseach Enda Kenny talks to mourners at the funeral of PSNI Constable Ronan Kerr in Beragh in Co Tyrone.
Mrs Sally Brady with deputy First Minister Martin McGuinness (left) and her son, Sinn Fein Assembly member Mickey Brady in Stormont.
Rhodri Morgan, (left) greets Northern Ireland Deputy First Minister Martin McGuinness at the British-Irish council meeting in Swalec Stadium, Cardiff, Wales.
McGuinness (left) and First minister Ian Paisley (centre) welcome US Ambassador to Ireland Tom Foley to the USNI Investment Conference at Stormont Parliment in Belfast.
McGuinness hands with newly appointed Victims Commissioner, Bertha McDougal. She was introduced along with 3 other commissioners at Stormont.
McGuinness arrives at Government Buildings in Dublin for talks with Taoiseach Bertie Ahern.
Ian Paisley (centre) and Deputy First Minister Martin McGuinness (left), welcome Taoiseach Bertie Ahern to the North-South ministerial conference at the City Hotel, Armagh.
Ian Paisley (left), and new Deputy First Minister Martin McGuinness (right), welcome to Stormont Consul General of the Chinese Embassy in London, Yuansong Jiang (second right) and second Secretary Consul Chinese Embassy Hongmei Liu (second left).
McGuinness and Gerry Adams arrive at Stormont Assembly in Belfast.
Dermot Ahern with Martin McGuinness (right) of Sinn Fein at the Rathmore shopping centre.
McGuiness (C) meets Colin Parry (R) and Wilf Bal at The Tim Parry Johnathan Ball Peace Centre in Warrington. The Parry's 12 year old son Tim was killed by an IRA bomb in Warrington. * town centre in 1993 along with three year old Johnathan Ball.
Gerry Adams, left, with Martin McGuinness leaving Castle Buildings, Belfast, after their meeting with Peter Mandelson.
Gerry Adams (C) and Martin McGuinness (R) welcome Roelf Meyer, a key figure in the South African peace process, to Castle Buildings in Belfast, for talks on the on the Mitchell review of the implementation of the Good Friday Agreement.