Hereafter a notice issued by the Secretariat of State of the Holy See

In response to frequent requests for information concerning the recognition by the Holy See of Equestrian Orders dedicated to the saints or to holy places, the Secretariat of State considers it opportune to reiterate what has already been published, namely that, other than its own Equestrian Orders (i.e.: the Supreme Order of Christ, the Order of the Golden Spur, the Pian Order, the Order of Saint Gregory the Great, and the Order of Pope Saint Sylvester), the Holy See recognizes and supports only the Sovereign Military Order of Malta – also known as the Sovereign Military Hospitaller Order of Saint John of Jerusalem of Rhodes and of Malta – and the Equestrian Order of the Holy See Sepulchre of Jerusalem. The Holy See foresees no additions or innovations in this regard.

All other orders, whether of recent origin or medieval institution, are not recognized by the Holy See. Furthermore, the Holy See does not guarantee their historical or juridical legitimacy, their ends or organizational structures.

To avoid any possible doubts, even owing to illicit issuing of documents or the inappropriate use of sacred places, and to prevent the continuation of abuses which may result in harm to people of good faith, the Holy See confirms that it attributes absolutely no value whatsoever to certificates of membership or insignia issued by these groups, and it considers inappropriate the use of churches or chapels for their so-called “ceremonies of investiture”.

Here follows a link to the article:

http://www.news.va/it/news/precisazione-della-segreteria-di-stato-in-merito-5