Banū Mūsā
The Banu Musa worked in astronomical observatories established in Baghdad by the Abbasid Caliph al-Ma'mun as well as doing research in the House of Wisdom . 
<triplet> al-Ma'mun <subj> Abbasid <obj> country of citizenship <triplet> House of Wisdom <subj> Abbasid <obj> located in the administrative territorial entity <subj> al-Ma'mun <obj> founded by