The siege of Nicaea of 1113 occurred in the course of the Byzantine-Seljuk wars.

This article relies largely or entirely on a single source. (July 2011)

Following the success of the First Crusade and the failure of the Crusade of 1101, the Seljuq Turks resumed their offensive operations against the Byzantines. 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 Sultanate of Rum was finally brought to battle when it unsuccessfully laid siege to Nicaea.

• Norwich, John Julius (1997). A Short History of Byzantium. New York: Vintage Books.