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Al-Hajjāj ibn Yūsuf (Arabic: الحجاج بن يوسف, also known as Hajjāj ibn Yūsuf ath-Thaqafī; also known as Haccac-i Zalim in Turkish meaning 'The Tyrant Hajjāj'), born in June 661 in aţ-Ţā'if and died 714 in Wasit, Iraq , was an important Arab administrator during the Umayyad Caliphate. His given name was Kulayb "Little Dog" but he changed it to al-Hajjaj before being appointed Governor of Iraq.
The administrative language of Iraq officially changed from Middle Persian (Pahlavi) to Arabic during his governorship. The records of administrative documents ( diwans) of Iraq transferred from Pahlavi to Arabic.