Alexander the Great was extremely fond of his warhorse Bucephalus. The horse is said to have allowed no other man to mount him when he wore the royal trappings, and apart from Alexander only his groom1 when unsaddled. Once, when wounded in battle, he refused to let Alexander change to another mount.
During Alexander's campaign in Hyrcania, Bucephalus was stolen by the Mardians. Alexander was furious, and declared that if the horse were not returned, he would kill every single Mardian, irrespective of age and sex. The Mardians responded quickly, and sued for peace.
Bucephalus was killed in battle in 326 BC at the great age of 30. Such was Alexander's grief that he had a city founded around Bucephalus' tomb, which was called Alexandria Bucephala.