Джувейни
His main rise to prominence began after Battle on Ağsu banks against Golden Horde on 19–20 July 1265. Although Prince Yoshmut's army defeated Nogai, his father Qutu Buqa died in this battle. Just like Buqa, as an orphaned person whose father died in battle he was given great importance and care by Abaqa, later he became his "inaq" - a trusted follower and a member of "keshig". As new position as vizier Majd al-Mulk Yazdi's overseer, he imprisoned Ata-Malik Juvayni on behalf of Abaqa in 1281, accusing him of embezzling the treasure - a charge that was brought by Majd al-Mulk. Soon after Abaqa's death in 1281, Taghachar was among the commanders who appeared on Tekuder's election with new ilkhan's mother Qutui Khatun. Nevertheless, he supported Arghun later, who believed Juvayni brothers were responsible for his father's death by poisoning. Tekuder seeing Arghun as a strong rival, he seized Taghachar among other emirs who supported Arghun and kept imprisoned in Tabriz. He was released after Tekuder's arrest on 26 July 1284 and became one of the prominent emirs under Arghun.