Born by 1130, the salernitan doctor Maurus died in 1214, and his numerous writings are today rather scattered and sometimes not even published. The medical semiology holds a big part in its production, and he wrote about urines, blood, and fever; the uroscopy in particular takes the lion's share there, and we shall not forget neither that he composed a comment on Theophilus, nor that he wrote a comment of the Aphorisms of Hippocrates speaking about many of the urines. Furthermore, the anonymous Liber de urinis passed on by the famous codex of Breslau disappeared in 1945 (olim Stadtbibliothek, 1302, F 156r-174v) is apparently due to Maurus. Besides his main uroscopic treatise, the Regulae urinarum edited by Renzi in the XIXth century, it is ...