Britain's Prince Charles is beginning a royal visit to Ireland on which he will meet Sinn Fein president Gerry Adams.
It's the first meeting meeting in the Republic of Ireland between a Sinn Fein leader and a member of Britain's Royal Family.
Sinn Fein is the biggest nationalist party in Northern Ireland and was previously known as the political wing of the terrorist organisation the IRA.
On Wednesday Prince Charles will visit the village where his great-uncle Earl Mountbatten was killed in 1979 by an IRA bomb.
Irish history expert, Professor John Tonge says it's an important moment.
IN: "Relations...
OUT: ...personal grief."
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