Suleyman Shah
According to Pseudo-Sphrantzes, later tradition held that John assumed the name Tzelepes—a Greek rendering of the Turkish honorific "Çelebi", a term indicating noble birth, a "lord" or "gentleman"—but Pseudo-Sphrantzes himself casts doubt on this information, and suggests that that Tzelepes was another person entirely. According to this later tradition, John and his Seljuq wife had a son, Suleyman Shah, who proved a very capable leader and was active at about the time of the Fourth Crusade. This Suleyman Shah was supposedly the father of Ertuğrul, the forefather of the Ottoman dynasty. As Konstantinos Varzos points out, this descent is unlikely, purely due to the chronological distance of the persons involved, and has generally been dismissed as fictitious by modern scholars.