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Princess Grace of Monaco with the Irish Prime Minister (or Taoiseach) Sean Lemass at a State Banquet in Dublin, circa June 1961. (Photo by Ray Bellisario/Popperfoto/Getty Images)

Princess Grace of Monaco with the Irish Prime Minister (or Taoiseach) Sean Lemass at a State Banquet in Dublin, circa June 1961.   (Photo by Ray Bellisario/Popperfoto/Getty Images)