"And when he got into the boat, his disciples followed him. And behold, there arose a great storm on the sea, so that the boat was being swamped by the waves. But he was asleep. And they went and woke him, saying, "Save, Lord! We are perishing!" And he said to them, "Why are you afraid, you of little faith?" Then he rose and rebuked the winds and the sea, and there was a great calm. And the men marveled, saying, "What sort of man is this, that even winds and sea obey him?" (Mt 8:23-27)Here is another medieval representation, from the Hitda Gospels, ca. 1020.And this image of another sea-wonder may be the one that Claire was thinking of. It's from the medieval (late 12th-century) mosaics in the cathedral of Monreale, Sicily.