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Al-Wathiq
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Abū Jaʿfar Hārūn ibn Muḥammad al-Wathiq bi'Llah (Arabic: أبو جعفر هارون بن محمد, romanized: Abū Jaʿfar Hārūn ibn Muḥammad;, commonly known by his regnal name al-Wathiq bi'Llah, was an Abbasid caliph who reigned from 842 until his death in 847.