(Lateran Treaty of 1929, Article 15 (Ibidem)) However, the Holy See fully owns these three basilicas, and Italy is legally obligated to recognize its full ownership thereof (Lateran Treaty of 1929, Article 13 (Ibidem)) and to concede to all of them "the immunity granted by International Law to the headquarters of the diplomatic agents of foreign States" (Lateran Treaty of 1929, Article 15 (Ibidem)).