The Constantinian Order counts among its ranks much of the old aristocracy of the Two Sicilies, royals and nobles, cardinals, statesmen, industrialists, scientists, parliamentarians, clerics, diplomats, scholars, faith leaders, charity workers and volunteers from across the world. The Order has delegations in every region of Italy, as well as in Switzerland, the United Kingdom, Ireland, United States of America, France, Germany, Portugal, Gibraltar, Spain, Japan, Brazil, Mexico, Monaco, Hungary, Malta, San Marino, The Netherlands, Belgium and Poland. In 2006, the Grand Master also created for the first time, a worldwide Delegation for Inter-Church and Inter-Faith relations based within the Grand Magistry in Rome.
Membership of the Constantinian Order is by invitation only and following approval by the Council of the Delegation in which the postulant is resident, is then submitted to the Grand Magistry in Rome for further consideration. Approved postulants are then submitted to the Grand Master for a final decision.
The Order is divided into four principal categories of Justice, Special, Grace and Merit. Within each category there are numerous grades from Knight of Office to Bailiff Knight Grand Cross with Collar. Bronze, Silver and Gold Benemerenti medals are also awarded for merit purposes although they do not constitute actual membership of the Sacred Military Constantinian Order.
Admission into the Justice category is restricted to those whose four grandparents can all prove 200 years of noble descent in the male line. In the Grace grade, with the exception of clerical members, 200 years of noble descent in the male line is required. Nobility in Great Britain is proved through the possession of a Coat of Arms on record at the College of Arms in London, the Court of the Lord Lyon in Scotland or the Office of the Chief Herald in Ireland. No proofs of nobility are required for admission into the category of Merit.
IN THE CATEGORY OF JUSTICE
IN THE SPECIAL CATEGORY
IN THE CATEGORY OF GRACE
IN THE CATEGORY OF MERIT