Ögedei had imperial princes tutored by the Christian scribe Qadaq and the Taoist priest Li Zhichang and built schools and an academy. Ögedei Khan also decreed to issue paper currency backed by silk reserves and founded a Department responsible for destroying old notes. Yelu Chucai protested to Ögedei that his large-scale distribution of appanages in Iran, Western and North China, and Khorazm could lead to a disintegration of the Empire. Ögedei thus decreed that the Mongol nobles could appoint overseers in the appanages, but the court would appoint other officials and collect taxes.