Omar Khayyam was a Persian polymath, mathematician, philosopher, astronomer, and poet. In the field of mathematics, he is best known for his work on the classification and solution of cubic equations. As an astronomer, he designed a solar calendar known as the Jalali calendar. His philosophical attitude towards life had elements of pessimism, nihilism, Epicureanism, and fatalism.
Apart from being a pioneer of Indology and geodesy, Persian scholar Abū Rayḥān al-Bīrūnī also worked on subjects such as anthropology, math, and ethnography. It is believed he didn’t know his father. He had penned many works, such as the encyclopaedic volume The Chronology of Ancient Nations.
Persian polymath Nasir al-Din al-Tusi lost his jurist father in childhood and then went around as a scholar, learning subjects such as math and philosophy. He made invaluable contribution to astronomy and later served as a scientific advisor of the Mongols. One of his notable written works was Akhlaq-i Nasiri.