Wrestling represents one of the oldest forms of combat. The origins of wrestling go back 15,000 years through cave drawings. Babylonian and Egyptian reliefs show wrestlers using most of the holds known in the present-day sport. Literary references to it occur as early as the Old Testament and the ancient Indian Vedas. In the Book of Genesis, the Patriarch Jacob is said to have wrestled with God or an angel. The Iliad, in which Homer recounts the Trojan War of the 13th or 12th century BC, also contains mentions of wrestling. Indian epics Ramayana and Mahabharata contain references to martial arts including wrestling. In ancient Greece wrestling occupied a prominent place in legend and literature; wrestling competition, brutal in many aspects, served as the focal sport of the ancient Olympic Games. The ancient Romans borrowed heavily from Greek wrestling, but eliminated much of its brutality.