The Sacred Military Constantinian Order of Saint George is an ancient and internationally recognised Order of Knighthood which, from its remotest origins, has resolved to work for the glorification of the Cross, the propagation of the Faith, and the defence of the Holy Roman Church, to which it is strictly bound through special merits acquired in the East, and for which manifold evidences of gratitude and benevolence have been expressed by successive Supreme Pontiffs of the Roman Catholic Church.

The Grand Master and Head of the Royal House of Bourbon Two Sicilies is: His Royal Highness Prince Charles of Bourbon Two Sicilies, Duke of Castro.

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