Sacred bulls have held a place of significance in human culture since before the beginning of recorded history. They appear in cave paintings estimated to be up to 17,000 years old. The mythic Bull of the Heavens plays a role in the ancient Sumerian Epic of Gilgamesh, dating as far back as 2150 BC. The importance of the bull is reflected in its appearance in the zodiac as Taurus, and its numerous appearances in mythology, where it is often associated with fertility. See also Korban. In Hinduism, a bull named Nandi, usually depicted seated, is worshipped as the vehicle of the god Shiva and depicted on many of the images of that deity.