White horses are born white and stay white throughout their lives. White horses may have brown, blue, or hazel eyes. "True white" horses, especially those that carry one of the dominant white (W) genes, are rare. Most horses that are commonly referred to as "white" are actually "gray" horses whose hair coats are completely white.
Throughout history, white horses have been mythologized in many cultures. For example, Herodotus reported that white horses were held as sacred animals in theAchaemenid court of Xerxes the Great (ruled 486-465 BC), In more than one tradition, a white horse carries patron saints or the world saviour in the end times, including Hinduism, Christianity, and Islam.