Historic Handshakes: Queen Elizabeth, Former IRA Head
Martin McGuinness was chief of staff when the group killed the queen's cousin.
Sign of Peace Between Queen and Ex-IRA Leader
Queen Elizabeth II shakes hands with Martin McGuinness, the deputy first minister of Northern Ireland, as First Minister Peter Robinson, center, looks on at the Lyric Theatre June 27, 2012 in Belfast, Northern Ireland. McGuinness, a former Irish Republican Army commander, was the outlawed group's chief of staff when it assassinated Lord Louis Mountbatten, the queen's cousin, in 1979. (Paul Faith/Getty Images)
