The favourite horse of Alexander the Great, who tamed the horse as a boy and took it with him on his campaigns until its death, after a battle, in 326 BC.
Definition of Bucephalus in US English:
Bucephalus
proper nounbyo͞oˈsefələs
The favorite horse of Alexander the Great, who tamed the horse as a boy and took it with him on his campaigns until its death, after a battle, in 326 BC.