Nasir al-Din Mahmud, born in 1216, was the Zengid hereditary Emir of Mosul from 1219 to 1234 (died 18 years old). He was successor to his brother Nur al-Din Arslan Shah II, and was only three years old when he ascended the throne. He was the last Zengid ruler of Mosul, and remained under the control of the atabeg of Mosul, Badr al-Din Lu'lu'. Badr al-Din Lu'lu' may have assassinated the young ruler following the death of his maternal grandfather the Emir of Erbil, Muzaffar al-Din Gökböri. Lu'lu' then began to rule Mosul in his own right.

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