[1][2] Iranshah is the author of two epic poems, Kush-nama and Bahman-nama, both written in the same style as the Shahnama of Ferdowsi (died 1019/25).
[3] Although no mention of its author is made in either of the works, the Mujmal al-tavarikh va al-qisas (written in 1126) credits Iranshah with its composition.
[2][1] Iranshah most likely wrote the Bahman-nama between 1092 and 1108, as indicated by mentions of historical events, and reverence of the sultans Mahmud I (r. 1092–1094) and Muhammad I Tapar (r. 1105–1118).
Set in the mythological Iranian world, the work tells the adventures of Kay Bahman, the son of Isfandiyar.
[2] The modern Iranian historian Jalal Matini ranks Iranshah as the third best writer of epic poetry among his contemporaries, behind Ferdowsi's Shahnama and Asadi Tusi's Garshasp-nama.