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Marriage between Christians and Muslim rulers, although uncommon, was not unprecedented. Speros Vryonis provides several examples from the Sultanate of the Seljuk Turks, beginning with Kilij Arslan II. A later example is Michael VIII Palaiologos marrying off his illegitimate daughters Euphrosyne and Maria to Nogai Khan and Abaqa Khan respectively. Previous Emperors of Trebizond had married off his female relatives, most notably Alexios III, during whose reign two of his sisters and two of his daughters were married to rulers of neighboring Muslim states.