Hans Biedermann's Dictionary of Symbolism has this to say about the gryphon:
A fabulous animal, symbolically significant for its domination of both the earth and the sky - because of its lion's body and eagle's head and wings. It has typological antecedents in ancient Asia, especially in the Assyrian k'rub, which is also the source of the Hebrew cherub. The frequent representations of griffin-like creatures in Persian art made them symbolize ancient Persia for the Jews. In Greece the griffin was a symbol of vigilant strength; Apollo rode one, and griffins guarded the gold of the Hyperboreans of the far north. The griffin was also an embodiment of Nemesis, the goddess of retribution, and turned her wheel of fortune. In legend the creature was a symbol of superbia (arrogant pride), because Alexander the Great was said to have tried to fly on the backs of griffins to the edge of the sky. At first also protrayed as a satanic figure entrapping human souls, the creature later became (from Dante onward) a symbol of the dual nature (divine and human) of Jesus Christ, precisely because of its mastery of earth and sky. The solar associations of both the lion and the eagle favored this positive reading. The griffin thus also became the adversary of serpents and basilisks, both of which were seen as embodiments of satanic demons. Even Christ's Ascension came to be associated with the griffin. The creature appeared as frequently in the applied arts (tapestries, the work of goldsmiths) as in heraldry. In the latter domain, Boeckler (1688) offered the following interpretation: "Griffins are protrayed with a lion's body, an eagle's head, long ears, and an eagle's claws, to indicate that one must combine intelligence and strengt