As a prerogative recognised in international law, a dynastic order of knighthood is vested not in the national territory or the headship of a sovereign state, but in the person of the head of a royal dynasty, and various royal decrees issued between 1734 and 1861 make it clear that the Grand Magistry of the Constantinian Order is inseparable from the Headship of the Royal House of the Two Sicilies. For this reason, the Constantinian Order survived the fall of the Kingdom of the Two Sicilies.
The Order continues to have an excellent working and spiritual relationship with the Apostolic See, recognition from many royal dynasties and governments, and the Sovereign Military Order of Malta. The Italian Republic fully recognises the Order and its activities by Presidential or other decrees.
The Constantinian Order also maintains Consultative Status of the Economic and Social Council at the United Nations in New York, Geneva and Vienna.