Tus (Persian: توس, romanized: Ṭūs) was an ancient city in Khorasan near the modern city of Mashhad, Razavi Khorasan province, Iran. To the ancient Greeks, it was known as Susia (Ancient Greek: Σούσια). It was also known as Tusa.[1] The area now known as Tus was divided into four cities, Tabran, Radakan, Noan and Teroid, which in combination formed largest city in the region in the fifth century.[citation needed]
In 1220, Tus was sacked by the Mongol general, Subutai, and a year later Tolui would kill most of its populace,[6] and destroying the tomb of Caliph Harun al-Rashid in the process.[7] Decades later, Tus would be rebuilt under the governorship of Kuerguez.[7]
'^Tus, V. Minorsky, The Encyclopaedia of Islam, ol. X, ed. P.J. Bearman, T. Bianquis, C.E. Bosworth, E. van Donzel and W.P. Heinrichs, (Brill, 2000), 741.
Frye, R. N. (1975). "The Sāmānids". In Frye, R. N. (ed.). The Cambridge History of Iran, Volume 4: From the Arab Invasion to the Saljuqs. Cambridge: Cambridge University Press. pp. 136–161. ISBN978-0-521-20093-6.