An illustrated guide to predicting the future and analysing the personality through careful study of the hand. William John Warner, popularly known as Cheiro (November 1, 1866 – October 8, 1936), was an Irish astrologer and colourful occult figure of the early 20th century. His sobriquet, Cheiro, derives from the word cheiromancy, meaning palmistry. He was a self-described clairvoyant who learned palmistry, astrology, and Chaldean numerology in India during his stay there.