Rukn al-Din Abu al-Muzaffar Arslan Shah Ibn Tughril II (1133–1176) was a Seljuk sultan who appointed as ruler of Iraq and Persia.

His reign was distinguished by the influence and dominance of the prince and founder of the Atabeg of Azerbaijan, “Shams al-Din Eldiguz,” after the death of Arslan's father.

Shams al-Din became the atabeg of Arslan Shah bin Tughrul and was given the rule of the Arran region in the year 541 AH/1146 AD.

He began to expand his influence in the neighboring regions and seized most of Azerbaijan, the mountains, Hamadan, Isfahan, and Ray, and made Tabriz his capital.

He was able, with his competence, good management, and the assistance of his two sons, Muhammad Jahan Pahlawan and Muzaffar al-Din Uthman Qazil Arslan, to repel the plots of the enemies and defeat them.

Before Arslan Shah's rule, Sultan Muhammad was worried after Al-Muqtafi Al-Abbasi had grown in power, and he gathered with his supporters and launched an attack on Baghdad.

[3] Shams al-Din Eldiguz earned the title of “The Great Atabeg” and effectively took control of the Seljuk Sultanate in Iraq.

The Georgians took advantage of the absence of Eldiguz in the region and attacked the cities, killing many local residents and plundering people's property.

[5] When the news of Shams al-Din Eldiguz's death reached Jahan Pahlawan, he immediately departed from Hamadan to Nakhchivan, and seized the state treasury and the throne's possessions.

[6][7] After Eldiguz died in 1175, the princes, dissatisfied with his policy, took advantage of Jahan's departure from Hamadan to incite Sultan Arslan Shah to attack Azerbaijan with a large army.

[8] But Sultan Arslan Shah invited Jahan to the capital, reconciled with him, and died shortly after handing over the administration of the state to him.