 Alexios I called upon the Sultan of the Seljuk Sultanate of Rum Kilij Arslan I (), who was married to Tzachas's daughter Ayşe Hatun and was thus his son-in-law, to attack Tzachas from the rear.The Sultan advanced to Abydos, where, at the pretext of inviting Tzachas to a banquet, he had his father-in-law murdered.However, a "Tzachas"—possibly the original Tzachas' son—is reported as still holding Smyrna when the Byzantine army under John Doukas recaptured the city.