San Miguel Bridge over the Aragón River in Jaca, Huesca (Spain)

In a cave on the slopes of Peña Oroel lived a Dragon that frightened the whole valley. One day, a Jacean knight who was imprisoned for defending the local witches proposed his release in exchange for killing the dragon. This gentleman, thanks to his friendship with the witches, knew that the dragons had a secret: they were able to hypnotize their victims with their eyes. Thus, he polished his shield into a mirror and set out to visit the dragon cave when it was asleep. When waking up, the dragon was reflected in the shield and was mesmerized by his own gaze. The knight took advantage of the situation to stick the sword in his heart and take him down.

Legend of Jaca