Abu Nasr Ali ibn Ahmad Asadi Tusi was a Persian poet, linguist and author. He was born at the beginning of the 11th century in Tus, Iran, in the province of Khorasan, and died in the late 1080s in Tabriz. Asadi Tusi is considered an important Persian poet of the Iranian national epics. His best-known work is Garshaspnameh, written in the style of the Shahnameh.

Tus was an ancient city in Razavi Khorasan Province in Iran near Mashhad. To the ancient Greeks, it was known as Susia. It was also known as Tusa. Tus was divided into four cities, Tabran, Radakan, Noan and Teroid. The whole area which today is only called Tus was the largest city in the whole area in the fifth century.