Kāʾūs I

…sons and successors, ʿIzz al-Dīn Kāʾūs I (1211–20) and ʿAlāʾ al-Dīn Kay-Qubādh I (1220–37), the Anatolian Seljuqs achieved the zenith of their power. Ghiyās̄ al-Dīn Kay-Khusraw I reunified the Seljuq state and began to expand at the expense of what was left of the Byzantine Empire in the west and…