Kammala wannan jumlar: İsa yana daya daga cikin 'ya'yan Beyazid I, sarkin Ottoman. Mahaifiyarsa ita ce Devletşah Hatun, 'yar Süleyman Shah na Germiyanids da Mutahhara Abide Hatun, 'yar Sultan Veled. İsa ya yi aiki a matsayin gwamnan sanjak a Antalya kuma ya yi yaƙi a cikin
Yaƙin Ankara a cikin 1402 tare da mahaifinsa. An ci sojojin Ottoman, Timurlane ya kama Beyazid I, kuma İsa ya tsere zuwa yammacin Anatolia.