The Priory of Sion, despite having far more ancient roots, in fact was founded by Godfrey of Bouillon in 1099 and is historically tied to the Merovingian Dynasty, as is well known. The antiquity of the deposit, emerges also through the symbolic elements in  collateral or direct relation to the Order, as the title of "Fisher Kings" given to the Merovingian kings, a title that symbolically connects to Babylon, referring to Nimrod, the Babylonian deity represented by a man with the fish head or with a headdress shaped like a fish, an element which will then also taken up by the Vatican as the papal headgear.

This binding of the Priory of Sion with the Merovingian Dynasty was further celebrated officially in November 2016, through the recognition by the Merovingian Royal House de Gevaudan, through the person of S.A.R.S. Dominus Esteve IV Rubén Albert I de Gevaudan, the last heir of the Gevaudan lineage, Royal House of Merovingian lineage, descendants precisely by the Counts of Autun, who through Ermengarde gave light to the Counts of Toulouse.

Actually, the Priory of Sion is one of the very few Orders of chivalry in the world to enjoy the privilege and prestige of being recognized by a Royal House.