Nasir al-Din al-Tusi was a prominent Persian polymath born in 1201 in Tus, Iran. He made significant contributions to various fields, including astronomy, mathematics, and philosophy. Al-Tusi is best known for his work in developing trigonometry and for his influential astronomical model, which improved upon the Ptolemaic system. In addition to his scientific achievements, al-Tusi founded the Maragheh Observatory in 1259, which became a center for astronomical research. His writings, such as the Tusi-couple, played a crucial role in the transition from medieval to modern science, influencing later scholars in both the Islamic world and Europe.