Omar Khayyam was born near Naishpur in Khorasan around 1048. There s little that is known about his life. He was involved in the redoing of the Persian Calendar. He was friends with some students, Hasan Tusi(who was the Chamberlian of Seljuq court) and Hasan Sabbah (who was the founder of the order of assassins). They had a pact to help each other.