What Middle Eastern writing composed the rubaiyat?

Rubaiyat is a form of poetry, just like a sonnet or limerick is a form of poetry. Rubaiyat is the Arabic word for Quatrain and, like quatrains, rubaiyats are poems made of four verses and can be written by anyone.

The most famous rubaiyats are those of Omar Khayyam, who was a Persian poet and polymath.