6 Under that same prince, who offered and dedicated his sceptre to the Mother of God and blessed Peter, that exchange of deeds of zeal and duty between the Roman pontiffs and the kings and people of Hungary began, which we have already praised. A permanent symbol of this bond was the royal crown adorned with images of Christ the Savior and the Apostles which Our predecessor Sylvester II sent as a gift to Stephan, when he conferred on him the title of king because "he had greatly spread abroad the faith of Christ"(1) in your country. That famous incident establishes the constancy of the Hungarians in their obedience to Peter, for this crown has borne the brunt of the shifting and dangerous squalls of critical times unscathed, still radiant with its ancient honor; consequently it has always been regarded as the great glory and defense of the kingdom, and therefore protected religiously.
Source: Insignes (Vatican.va)