How about a little Old Testament action in the early Middle Ages?
Saint Martin of Vertou was a sixth century aristocrat, pious from childhood, who felt a vocation from God. He was ordained a deacon by Saint Felix, Bishop of Nantes, and sent to evangelize the area south of the Loire. He went to a coastal city called Herbauges, a thriving port city that venerated its multiple deities and idols. He preached with very little success, having persuaded only a man named Roman, Roman's wife, and their son Pierre to accept baptism. Martin warned them to leave this iniquitous city, which was wise since the Wrath of the Lord fell upon it. Flood waters rose and washed away all traces of the place -- nothing left for archeologists even to verify its existence.
Vertou was the center of Martin's religious colony. Legend has it that he stuck his staff in the ground in the center of present-day Vertou and it sprouted. This is not an uncommon theme with saints, but in Martin's case, the yew tree that grew from his staff became the central image on the regional coat of arms.