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Ghiyās od-Dīn Abul-Fatah Omār ibn Ibrāhīm Khayyām Nishābūrī or Omar Khayyam (Nishapur, Persia, May 18, 1048 – December 4, 1131) was a Persian poet, mathematician, philosopher and astronomer who lived in Persia. His name is also given as Omar al-Khayyami[1].

He is best known for his poetry, and outside Iran, for the quatrains (rubaiyaas) in Rubaiyat of Omar Khayyam, popularized through Edward Fitzgerald's re-created translation. His substantial mathematical contributions include his Treatise on Demonstration of Problems of Algebra, which gives a geometric method for solving cubic equations by intersecting a hyperbola with a circle[2]. He also contributed to calendar reform and may have proposed a heliocentric theory well before Copernicus.

He spent part of his childhood in the town of Balkh (present northern Afghanistan), studying under the well-known scholar Sheik Muhammad Mansuri. Subsequently, he studied under Imam Mowaffaq Nishapuri, who was considered one of the greatest teachers of the Khorassan region.

According to a well-known legend called Three Schoolmates, two other exceptional students studied under the Imam Mowaffaq at about the same time: Nizam-ul-Mulk (b. 1018), who went on to become the Vizier to the Seljukid Empire, and Hassan-i-Sabah (b.1034), who became the leader of the Hashshashin (Nizar Ismaili) sect. It was said that these students became friends, and after Nizam-ul-Mulk became Vizier, Hassan-i-Sabah and Omar Khayyám each went to him, and asked to share in his good fortune. Hassan-i-Sabah demanded and was granted a place in the government, but he was ambitious, and was eventually removed from power after he participated in an unsuccessful effort to overthrow his benefactor, the Vizier. Omar Khayyám was more modest and asked merely for a place to live, study science, and pray. He was granted a yearly pension of 1,200 mithkals of gold from the treasury of Nishapur. He lived on this pension for the rest of his life.