Bucephalus

Bucephalus, a wild horse that could not be tamed, was the famous steed of Alexander the Great.
The horse was finally tamed by his owner and the two of them
went on to be victorious in many battles. The name, Bucephalus, actually means “ox head”.
 

The Image of the head of Bucephalus showing his mythical horns can be found on Ancient Greek Coins, from the Seleukid Kingdom of Antiochus I Soter (280-261 B.C.). The name has been ascribed to a branding mark of an ox-head on its haunch.