What anyone who tries to recount the multitude of miracles of Saint Demetrius observes is that, apart from his countless interventions on a personal level, there is a significant number of miracles that directly concern the existence of his Church and the city of Thessaloniki itself. Through these, we see that the most important moments in the history of the co-capital of the Byzantine Empire bear the seal of the protector and savior Saint Demetrius. Just as the capital had become the primary target of the empire's enemies at that time and could not survive without the repeated interventions of the Virgin Mary, to whom it was dedicated, so too did the co-capital Thessaloniki become the second target of their raids, from which it remained intact only thanks to its protector, the great martyr Demetrius. Because of the great historical and religious significance of these miraculous events, which are narrated in detail, we will mainly limit ourselves to recounting those that we consider sufficient to demonstrate the greatness of the saint.