Omar Khayyám ; born Ghiyāth ad-Dīn Abu'l-Fatḥ ʿUmar ibn Ibrāhīm al-Khayyām Nīshāpūrī (/ˈoʊmɑːr kaɪˈjɑːm, -ˈjæm, ˈoʊmər/; Persian: غیاثالدین ابوالفتح عمر ابراهیم خیام نیشابورﻯ, pronounced [xæjˈjɑːm]; 18 May 1048 – 4 December 1131), was a Persian mathematician, astronomer, philosopher, and poet, widely considered to be one of the most influential thinkers of the Middle Ages.