This paper is about the fírst astronomical work of Mubyi al-Dio alMaghribi 1 , aD AndalusI-MaghribI astronomer who worked in Damascus and Mariigba. His first dated astronomical work is the zij titled Tiij al-azyiíj wa-ghunyat al-mu.btiij (The Crown of tbe Astronornical Handhooks and the Satisfaction of the Needy). l know of three copies of this zij: ane in the Escorial Library, numbered Árabe 932 (Ms. E), another in the Chester Beatty Library, Dublin (Ms. N. 4 129, Ms. D) and another in tbe Department of Arabic Philology of the University of Barcelona (Ms. B). Ms. E (fol. 57v) states that the zij was compiled in Damascus in 656H1 1258. This copy was made by Muzaffar ¡bn 'Abd AlUih in Tunís in 797H1 1394.