The Gran Commenda di Santi Giovanni e Lazzaro di Gerusalemme is based in Italy under the protection of H.I.R.H. Prince don Ezra Annibale Foscari Widmann Rezzonico, Head of the Imperial House of Leopardi of Constantinople, and with the Grand Prior H.E. Arconte Antonino Iuculano. The Protectorate has entered into mutual agreements of full partnership, friendship, collaboration, accreditation and recognition with a number of the dependent institutions of the Abbey-Principality.
The Belarus Monarchist Association
The Constantinople Orthodox Institute
The Ecclesia Apostolica Divinorum Mysteriorum
The Grand Prix Humanitaire de France et des Colonies
The Institute of Arts and Letters (London)
The International College of Arms of the Noblesse
The Order of Antioch
The Order of the Crown of Thorns
The Order of the Lion and the Black Cross
The Order of the Holy Wisdom
The Byzantine Order of Leo V the Armenian
The Abbey-Principality of San Luigi 
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