[1] Serving the crown prince with much loyalty and determination, Abol-Qasem accompanied Abbas Mirza in his wars and was the architect behind his attempted reforms.

He was eventually reinstated once again and assigned to negotiate a peace treaty with Russia, who had inflicted a crushing defeat on the Iranians during the war, occupying parts of the Caucasus and most of Azerbaijan (including its provincial capital Tabriz).

[1][6] The almost total annihilation of the Iranian army and the taxing Russian demands caused further difficulties to Fath-Ali Shah and Abbas Mirza.

Ali Mirza Shaja ol-Saltaneh, a son of Fath-Ali Shah and governor-general of Khorasan, took advantage of the situation by forcing his father to acknowledge him as the new crown prince, albeit this lasted briefly.

[8] In the same year, Fath-Ali Shah appointed Abol-Qasem as the atabak-e azam (the principal tutor or guardian) of one his favourite sons, Farrokh-Siyar Mirza.

He was already disliked by the British and Russian legations due to his opposition to foreign and domestic pressure, and by the Davalu faction of the Qajars for his policy of centralization.

[11][14] The founder and editor of the weekly newspaper Adab ("Culture"), Adib al-Mamalek Farahani (died 1917), was a descendant of Abol-Qasem through both his parents.

"[17] In order to create prose that resembled a political slogan and acted as a encouragement to defend Iran, Abol-Qasem experimented with words that rhymed with mahrus.

The Scottish traveler and writer James Baillie Fraser (died 1856) refers to him as "a true Persian diplomatist, acute and far-sighted".

[5] The Czech orientalist Jan Rypka (died 1968) calls him an "uncommonly intelligent young man", as well as "incorruptible, noble and loyal.