"L'anno del sanctissimo giubileo il papa apre la porta santa" means "In the most holy year of the jubilee, the Pope opens the holy door". The door has a cross on it. The same closed door was before Heraclius when he went to Jerusalem with the Holy Cross and the door opened when he repented and entered barefoot. Here Heraclius is accompanied by Saint Helen. Historians talk about anachronism.
