On his way to solve the unrest in Khorasan in 808 ,the Abbasid Caliph Harun Al-Rashid fell ill and died in Tus
The city was almost entirely destroyed by Genghis Khan's Mongol conquest in 1220.
Some notable figures in the history of Iran who were born in Toos include: Geber, Ferdowsi, Asadi Tusi, Nizam al-Mulk, Al-Ghazali, Nasir al-Din al-Tusi and the prominent Shia Twelver scholar Abu Ja'far al-Tusi.