High Quality Content by WIKIPEDIA articles! Safi al-Din al-Urmawi (born ca. 1216 A.D in Urmia died in 1294 A.D.) was a renowned musician and writer on the theory of music. He is perhaps best known for developing in the thirteenth century the widely used seventeen tone scale later expanded to the Arabic scale of twenty-four quarter tones.He had also studied Shafii law and comparative law (Khilaf Fiqh ) at the Mustansiriyya Madrasa (opened 631/1234). This qualified him to assume a post in al-Musta?sim's juridical administration and, after 656/1258, to head the supervision of the foundations (na?ariyyat al-waqf) in Iraq until 665/1267, when Nasir al-Din Tusi took over.

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