نصير الدين الطوسي
In 1256 Nasir al-Din al-Tusi came to work at the Maragheh observatory after being attacked by a group of Mongols who came from the east. These Mongols ambushed Iran, crushing everything in their path. Nasir al-Din al-Tusi was located at the Alamut, a castle in the South Caspian province of Qazin, when the Mongols invaded. Hulagu Khan was the leader of the Mongols and grandson of Genghis Khan. He was a fearless leader and warrior who was determined to conquer not only the Alamut, but many other countries across the globe as well. In order to spare his life, Nasir al-Din al-Tusi told Hulagu that he could predict the future if only he had better equipment. Being interested in science, Hulagu believed him and appointed Nasir al-Din al-Tusi as the scientific advisor of the Mongols. Hulagu allowed Nasir al-Din al-Tusi to build an observatory, and Nasir al-Din al-Tusi chose Maragha, Iran. In 1259, the Maragheh observatory began construction, which took a total of three years to complete. Hulagu also put Nasir al-Din al-Tusi in charge of waqfs which were religious endowments. As director of the observatory, Nasir al-Din al-Tusi and his team were able to make fascinating discoveries in astronomy, physics, and mathematics.