Mesud I

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Masud I or Ma'sud I (ركن الدين مسعود, Rukn al-Dīn Mas'ūd; I. Mesud) was the sultan of the Seljuqs of Rum from 1116 until his death in 1156. Following the defeat and death of his father Kilij Arslan I by Radwan of Aleppo at Mosul in 1107, Masud lost the throne in favor of Melikshah. With the help of the Danishmends, Masud captured Konya and defeated Malikshah in 1116. Masud would later turn on the Danishmends and conquer their lands. When he died, Masud was succeeded by his son Kilij Arslan II.

One of Mesud's daughters married John Tzelepes Komnenos, a member of the royal house of Byzantium who had converted to Islam.