Dū Dar, Madrasa, is a Tīmūrid-era building in Mashhad. It is situated in the centre of the Āstān-i Quds-i Raḍawī complex, west of the great bazaar and across from the Parīzād school. It was built in 843/1439, and is the oldest school of Mashhad that has inscriptions (Iʿtimād al-Salṭana, 2/255; Ḥakīm, 557). Judging by the seals found on the manuscripts kept at the school (Fāḍil, 1661; see Mawlawī, 76), its original name was the Yūsufiyya, which probably refers to Yūsuf Khwājah Bahādur, the person who built it (see below).
Dū Dar has been mentioned in the accounts of travellers such a…