The Green Man is frequently thought to be a Celtic emblem. He is the god of spring and summer in Celtic mythology. Year after year, century after century, he vanishes and reappears, performing themes of death and resurrection, the ebb and flow of life, and creativity. Sir Gawain, The Green Knight, from the Arthurian legend, is a well-known picture of the Green Man from the Middle Ages. Gawain wore a green helmet, armor, shield, and even rode a green horse. He survived even after he was decapitated.