E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Auld Hornie.
After the establishment of Christianity, the heathen deities were degraded by the Church into fallen angels; and Pan, with his horns, crooked nose, goat’s beard, pointed ears, and goats’ feet, was transformed to his Satanic majesty, and called Old Horny.
