In 1237 CE, Ḡīāṯ-al-Dīn Kayḵosrow II became sultan when his father, Kayqubad I (1219-1237 CE), died. He would reign until his death in 1245 CE. Let's start with a coin from the father, Kayqubad I . Seljuq of Rum, Ala al-din Kayqubad I, 1219-1237 CE, AH 616-630, Siwas mint in AH 617, AR Dirhem  (2.77g, 22 mm). Ref: Broome 172. Bar Hebraeus (1226 – 1286 CE), a bishop of the Syriac church, didn't think much of the Sultan Ḡīāṯ-al-Dīn Kayḵosrow II: "Then the new Sultan GHAYATH AD