MOst cultures have a story about the Tree of Life and Knowledge in the Garden of Eden. A Viking legend tells that Odin hung himself on the Tree of Life for nine days to gain knowledge. The Assyrian warriors of 1,200 BC carved a Tree of Life into their armor to protect them in battle.
There is a Hindu legend of a sacred tree that connects the earth to the sky. Pre-Columbian cultures also believed that there was a sacred tree connecting the earth to heaven. During Christian conversion era in Mexico, their Tree of Life was combined with the Cross of Christ. This cross is an example from that era.