The Iranian religious beliefs impact on Mongol masters inclination toward developing religious endowments (since Ogtay Khan (626 AH) to Qazaan Khan (694 AH))

Waqf is one of the cultural and social traditions of the Iranian era, which has been influenced by numerous factors throughout history. The present research sought to find the answer to the question of what is the relation between the development of the waqf tradition and religious beliefs of the people of that time. Research method is based on documentary information collection. The results showed that at the beginning of the Mongol`s invasion they constructed temples or churchs, but gradually they influenced by the beliefs of the Iranian Shiites and attempted to expand religious endowments. In addition, the two Islamic characters in their court, called Khajeen Siir-al-Din Tusi and Shamsuddin-i-Joveini, played a major role in the development and rehabilitation of the waqf tradition despite the contradiction of their beliefs with the rulers.