[6] During his years with the Ogedeyid family, he gained reputation among the members of the ruling blood because he was well educated and versed in Old Uyghur language.

He was appointed to oversee vast lands from Oxus to Anatolia with Sharaf al-Din Khwarazmi as his secretary, whom he had a distaste in.

When in 1260 Hulegu Khan requested the presence of Georgians and Armenians for the Mongol invasions of the Levant, David Ulu, king of the Eastern Kingdom of Georgia rebelled, remembering the losses of his troops in the 1258 Siege of Baghdad.

[11] A large Mongol army led by Arghun Aqa invaded Georgia from the south, inflicted a heavy defeat on David and Sargis I Jaqeli in a battle near Akhaldaba, and then brutally plundered the country.

It also says Arghun conducted the empire-wide census in Russia, Arctic, Alania, Pontic steppe, Georgia, Armenia, and Anatolia.

The Armenian noble, Sempad Orpelian, justified Arghun completely and charged his enemy, a Khorazmi lieutenant, with being the real offender.

He mainted his administrative tasks under Hulagu and even punished underpaying vassals who owed them taxes, including Gvantsa Kakhaberidze, Hasan Jalal of Khachen, Zakare III Zakarian, Akhsitan II and others in 1261.

Arghun Aqa fought in left flank under Prince Yoshmut in Battle of Herat on 22 July 1270 which resulted in a decisive victory.