Abu al-Qasim Kashani (Persian: ابوالقاسم کاشانی; died after 1324) was a Persian[1] historian from the Abu Tahir family, who was active during the late Ilkhanate era.
[2] He is notable for claiming that the vizier of the Ilkhanate, Rashid al-Din Hamadani, had stolen credit for the historical work Jami' al-tawarikh.
Although modern scholarship regard Rashid al-Din as the overall author of the work, he is generally considered to have been aided by several assistants, including Kashani.
It is there that Kashani makes his allegations against Rashid al-Din.
Since Rashid al-Din's account of this ruler in Jami' al-tawarikh is missing, whereas Kashani's work is complete, this gives some credibility to Kashani's claims.