“While griffins are most common in the art and lore of Ancient Greece, there is evidence of representations of griffins in Ancient Persian and Ancient Egyptian art dating back to before 3000 BC.In Egypt, a griffin can be seen in a cosmetic palette from Hierakonpolis, known as the "Two Dog Palette”, which is dated to ca. 3300-3100 BC. In Persia, griffins appeared on cylinder seals from Susa as early as 3000 BC.Griffin depictions appear in the Levant, Syria, and Anatolia in the Middle Bronze Age, dated at about 1950-1550 BC. Early depictions of griffins in Ancient Greek art are found in the 15th century BC frescoes in the Throne Room of the Bronze Age Palace of Knossos, as restored by Sir Arthur Evans. It continued being a favored decorative theme in Archaic and Classical Greek art.
In legend, griffins not only mated for life, but if either partner died, then the other would continue the rest of its life alone, never to search for a new mate. The griffin was thus made an emblem of the Church’s opposition to remarriage. A Hippogriff is a legendary creature, supposedly the offspring of a griffin and a mare. Being a union of a terrestrial beast and an aerial bird, it was seen in Christendom to be a symbol of Jesus, who was both human and divine. As such it can be found sculpted on some churches.
According to Stephen Friar’s New Dictionary of Heraldry, a griffin’s claw was believed to have medicinal properties and one of its feathers could restore sight to the blind. Goblets fashioned from griffin claws (actually antelope horns) and griffin eggs (actually ostrich eggs) were highly prized in medieval European courts.
When it emerged as a major seafaring power in the Middle Ages and Renaissance, griffins commenced to be depicted as part of the Republic of Genoa’s coat of arms, rearing at the sides of the shield bearing the Cross of St. George.
By the 12th century the appearance of the griffin was substantially fixed: “All its bodily members are like a lion’s, but its wings and mask are like an eagle’s.” It is not yet clear if its forelimbs are those of an eagle or of a lion. Although the description implies the latter, the accompanying illustration is ambiguous. It was left to the heralds to clarify that.“ -Wikia