The Abbey-Principality of San Luigi has entered into a Treaty of Friendship and Collaboration with the Ordo Supremus Militaris Templi Hierosolymitani (O.S.M.T.H.)
The Ordo Supremus Militaris Templi Hierosolymitani (Sovereign Military Order of the Temple of Jerusalem) continues the Templar tradition that was revived in France in 1705, reconstituted under Bernard Raymond Fabré-Palaprat in 1804, and recognized by the Emperor Napoléon I in 1805. It was under the leadership of Grand Master Fernando Campello Pinto Pereira de Sousa Fontes between 1960 and 2018. The present Grand Master is Fra Albino Neves.
The Prince-Abbot is a Knight Grand Cross of the Order.
The Italian Magistral Delegation of the Order maintains a website at http://www.cavalieritemplariosmth.it