Aleister Crowley, who devised the Thoth deck along with Lady Frieda Harris, stated of the Tarot: "The origin of this pack of cards is very obscure. Some authorities seek to put it back as far as the ancient Egyptian Mysteries; others try to bring it forward as late as the fifteenth or even the sixteenth century ... The only theory of ultimate interest about the Tarot is that it is an admirable symbolic picture of the Universe, based on the data of the Holy Qabalah."