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:
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