Nishapur has the dubious distinction of being ruined frequently by earthquakes and invaders. It was home to Omar Khayyam and Farid al-Din Attar, and devastated in AH 618/AD 1221 by the Mongol army commanded by Tolui, Chingiz Khan’s son. An overview of the fortifications of Nishapur; and excavation at Shadiyakh palace, HQ of Abdallah b. Tahir, Khurasan’s Abbasid governor