Magnus was a 13th-century Dominican bishop regarded as one of the greatest German philosophers and theologians of the Middle Ages. He taught Thomas Aquinas, was a major Aristotelian scholar and commentator, and wrote prolifically on myriad subjects. Extraordinarily well-read, he possessed an encyclopedic knowledge of a vast array of scientific and philosophical disciplines. Various legends portray him as a magician or alchemist. His refusal to ride horses earned him what affectionate nickname? Discuss
Source: The Free Dictionary