sentences:  Fifteen Seljuq emirs contributed to the cost.The work is commemorated by a bilingual Greek and Arabic inscription on a tower near the western gate.According to Rustam Shukurov, it is very probably that Kaykaus I and his brother Kayqubad I, who both spent considerable time in Constantinople with their father, had the same dual confessional (Christian and Muslim) and dual ethnic (Turkic/Persian and Greek) identity as Kaykhusraw I, Kaykaus II, and Masud II.