The philosopher and astrologer Scotus, who was famous for his translations from Greek and Arabic into Latin wrote a handbook of physiognomy for Emperor Friedrich II about 1228 A.D. In this volume based particularly on Arabic sources is a chapter on the voice. It contains numerous details that suposedly enable recognition of certain personality traits by voice characteristics. In the present such concepts are familiar, but that it was of practical relevance 750 years ago may justify closer inspection of Scotus and his work.