Deputy First Minister Martin McGuinness will attend a state banquet hosted by Queen Elizabeth II at Windsor Castle.
The event is being held as part of President Michael D. Higgins’ state visit to Britain, and will also be attended by First Minister Peter Robinson and Taoiseach Enda Kenny.
It will be held tomorrow evening and will be the first time a senior republican leader has attended such an event.
Announcing the move, Sinn Féin president Gerry Adams said it was an indication of the changes the peace process has brought about.
“Sinn Féin seeks a new and positive relationship between Ireland – all of Ireland – and Britain based on equality and mutual respect for the first time in our troubled history.
“We also seek an agreed, united Ireland which accommodates those who define themselves as British.
“It is within this context that I can confirm that deputy First Minister Martin McGuinness will accept an invitation to attend all events as part of the State visit.
“This decision by a confident republican leadership is in keeping with the transition that is ongoing within the island of Ireland and between Ireland, including the North, and Britain,” he said.