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'Abu al-Muzaffar Rukn ud-Dīn Barkyāruq bin Malikšāh' () was the sultan of Great Seljuk from 1094-1105.
He was a son of Malik Shah I and participated in the succession wars against his three brothers, Mahmud I, Ahmed Sanjar, and Mehmed I.
Barkiyaruq ascended to the throne young, and his detractors thought him too inexperienced and accused him of being a drunkard. He waged war to regain control of the core Seljuk land, lands that are today part of Iraq and Iran.
His land bordered Syria when the Franks arrived to battle the Saracens on the First Crusade, but at the time his main concern was controlling Mosul, Aleppo and Damascus, which were ruled in his name, but controlled by rivals.