The griffin

This is a hybrid being included in the bestiaries of fantastic animals and one of the most represented in the Middle Ages.  It is described as having the head of an eagle, and the body, paws and claws of a lion.  It is a strong animal that with its claws can lift up an armed man in flight, and even a horse or an ox. 
The griffin protects treasures, especially of gold and precious stones, among which the agate is the most prized by the animal, which is often kept in its nest.  In this sense we can understand the representation of the griffin of San Pedro de Arlanza, situated originally on the two sides of one of the windows of the court rooms of the royal palace.  In the paintings of Sixena, next to the sacrifice of Isaac, a griffin fights against a winged dragon, in the eternal battle between good and evil.
Furthermore, in its negative connotation it can also be symbolised as the devil which takes the soul of the sinners to hell.