H.M. King Peter II of Yugoslavia (1923-70) reigned as the third and last King of Yugoslavia between 1934 and 1945, when the monarchy was illegally abolished by the Communists. In his later years he was resident in the United States.

King Peter first met the future Prince-Abbot Edmond II in 1959, and subsequently the two men developed a friendship. King Peter accepted the Grand Cross and High Protectorship of the Order of the Crown of Thorns, and this position has been left vacant in his memory since his death in 1970. In 1962, King Peter issued Letters Patent to Prince-Abbot Edmond II creating him Marquis de Valjevo as well as recognizing him as Prince of San Luigi.

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