The rubaiyat are a series of poems or 'stanzas' by the famous 12th century Persian atronomer and philosopher

The Rubáiyát of Omar Khayyám (Persian: رباعیات عمر خیام‎) is the title that Edward FitzGerald gave to his translation of a selection of poems, originally written in Persian and numbering about a thousand, attributed to Omar Khayyám (1048–1131), a Persian poet, mathematician and astronomer. A ruba'i is a two-line stanza with two parts (or hemistichs) per line, hence the word rubáiyát (derived from the Arabic language root for "four"), meaning "quatrains". (Courtesy: Wikipedia)(less)