Qotb al-Din Mahmoud b. Zia al-Din Mas'ud b. Mosleh Shirazi (Persian: قطب‌الدینْ محمود بن ضیاءالدینْ مسعود بن مصلح شیرازی; 1236–1311) was a 13th-century Persian[1][2] polymath and poet who made contributions to astronomy, mathematics, medicine, physics, music theory, philosophy and Sufism.

Qutb al-Din was garbed by the Kherqa (Sufi robe) as blessing by his father, aged ten[citation needed].

Later on, he also received his own robe from the hands of Najib al-Din Bozgush Shirazni, a famous Sufi of the time[citation needed].

He quit his medical profession ten years later and began to devote his time to further education under the guidance of Nasir al-Din al-Tusi.

In his testament (Wasiya), al-Tusi advises his son ṣil-a-Din to work with Qutb al-Din in the completion of the Zij.

Subsequently, he traveled to Khorasan in the company of al-Tusi where he stayed to study under Najm al-Din Katebi Qazvini in the town of Jovayn and become his assistant.

In the year 1282, he was envoy on behalf of the Ilkhanid Ahmad Takudar to Sayf al-Din Qalawun, the Mamluk ruler of Egypt.

[6] Qutb al-Din had an insatiable desire[3] for learning, which is evidenced by the twenty-four years he spent studying with masters of the time in order to write his commentary on the Kolliyāt.