Taoist priests attend a memorial ceremony for Laozi (or Lao-tzu, Lao-tse 604-531 BC) 2,582 birth anniversary in Tianjing Palace (or Heavenly Peace Palace), Woyang County of east China's Anhui Province, March 19, 2011. Laozi, best known as the author of the Tao Te Ching, is traditionally considered as the founder of Taoism. The Heavenly Peace Palace in Woyang was the birth place of Laozi.