Letter from Prince Rainier of Monaco dated 2 February 1961, to President Eamon de Valera, in which he accepts with 'great pleasure', the invitation from the President for himself and Princess Grace to attend the International Festival of Music and Arts in Dublin in June of that year, in which the National Operatic Orchestra of Monaco is participating.
(NAI, Office of the Secretary to the President, PRES 1/P 4341)