A Catholic Dominican friar and bishop, considered the greatest German philosopher and theologian of the Middle Ages. He gained fame for advocating scientific and religious harmony and was made a saint by the Catholic Church in 1931. Albertus approved of judicial astrology and supported the practice of horary at a time when other medieval authorities were condemning it on the grounds that it contradicted the Catholic Church’s teaching on freedom of will. Albertus argued that horary does not inhibit free will, but rather enhances it by giving the querent better informed choices. His arguments on this matter are presented in his Speculum Astronomiae where he maintained that well known books on horary and judicial astrology should not be burned or considered unnatural.