Al-Qasim ibn Harun al-Rashid
Al-Qāsim ibn Hārūn ar-Rāshīd ibn Muḥammad al-Mahdī was an Abbasid prince, the third son of the Abbasid caliph Harun al-Rashid, and for a time third-in-line to the Abbasid throne.
Source: Wikipedia
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