Zünnun was declared as successor by his father Melik Mehmed Gazi, however he was derecognized by Yağıbasan.

Yağıbasan and his other two brother Ayn el-Devle and Nasreddin Muhammed marched into Kayseri and Zünnun took refuge to Mesud I which was his father-in-law.

After Melik İsmail was killed in a palace revolt,[1] Zünnun was in Syria at the time.

Kilijarslan II started to attack the Danishmendids and took Sivas, Niksar and Tokat.

Zünnun took refuge in Byzantine Empire, and the Sivas branch of Danishmendids collapsed.