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In symbolism, the griffin combines the symbolic qualities of both the lion and the eagle. It is the king of birds and lord of the air united with the king of beasts and lord of the earth.
One legend involving griffins is the Ascension of Alexander the great. According to this story, Alexander captured a pair of griffins and, having starved them for three days, hitched them to his throne and, teasing them with chunks of roast beef held above their heads on lances, flew heavenward for seven days. Alexander would've stolen a peek at God Himself if an angel had not asked him why he wanted to see the things of heaven when he did not yet understand the things of earth. Chastised for his presumptuousness, Alexander flew back to earth. Representations of Alexander's ascension were placed in French and Italian cathedrals during the 12th century.
The griffin's ability to soar like an eagle made him an emblem of poetic and spiritual inspiration. The eagle parts of the griffin represented the saints with their thoughts, aspirations, and souls lifted towards God. Its lion half stood for their courage in the arena and in the continuing struggle against sin, evil, and the Devil. As emblems of the saints, griffins are sometimes pictured eating fruit picked from the Tree of Life.
During captivity, Israelites would have become familiar with the griffin image. Both Persians and Assyrians decorated with images of this magical beast. Images of two griffins drinking from a flaming cup were common in the Persian religion, Zorastrianism. Later, the Crusaders, coming across this image, would be reminded of the Eucharist and the cup of fire became associated with the Holy Grail.
During the Middle Ages, Christian nobles searched for griffin's eggs or "grypeseye" which they mounted and used for cups, believing they brought health to any beverage.
Because of the griffin's strength and powers of sight, it was believed to guard hidden treasures and hide them in their nests with their young. Because of its association with the Holy Grail, one of the treasures most commonly guarded by griffins was emeralds. (The Holy Grail was carved from a single emerald. It was used to hold the wine at the Last Supper and believed to have magical powers.) Other popular treasures guarded by griffins were the Tree of Life, knowledge, and the roads to salvation. Greeks and Romans used griffin images to guard tombs.
Griffins are a symbol of the sun, wisdom, vengeance, strength, and salvation ... (thanasis.com)