Moses with horns:
http://www.google.com/search?q=moses+with+horns&ie=ISO-8859-1&hl=en&source=hp&gbv=1&sa=X&oi=image_result_group&tbm=isch
Alexander the Great with horns:
http://www.google.com/search?ie=ISO-8859-1&hl=en&source=hp&q=alexander+the+great+as+zeus+ammon&gbv=1&sa=X&oi=image_result_group&tbm=isch
Io, Pan! ping