The siege of Nicaea of 1113 occurred in the course of the Byzantine-Seljuk wars.
After suffering defeat at the hands of the First Crusade, the Seljuk Sultanate of Rum beat back the Crusade of 1101 and resumed its offensive operations against the East Roman (Byzantine) Empire. Emperor Alexios I Komnenos, suffering from old age, was unable to deal with the swift Turkish raids into what was left of Byzantine Anatolia. However, the Seljuk Turks were unsuccessful in their siege of Nicaea, which they had lost in the First Crusade.
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