sentences:  Upon the death of Kaykhusraw I at the Battle of Alaşehir in 1211, Kaykaus’ two younger brothers, Kayferidun Ibrahim and the future Kayqubad I, challenged his succession.Kayqubad initially garnered some support among the neighbors of the sultanate, Leo I, the king of Cilician Armenia, and Tughrilshah, his uncle and the independent ruler of Erzurum.At the same time, Kayferidun imperiled the recently acquired port of Antalya by seeking aid from the Cypriot Franks.