The Rubaiyat is a collection of poems written by the Persian poet Omar Khayyam in the 11th century. The Rubaiyat is composed of quatrains, or four-line verses, and is known for its philosophical and spiritual themes. Omar Khayyam was a mathematician, astronomer, and philosopher, and his work has been translated into many languages. The Rubaiyat is considered one of the most influential works of Persian literature.