According to Wikipedia:
Rubaiyat of Omar Khayyám 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.
Was Edward FitzGerald the first to collect these poems together and publish them in a unified work, or had there been previous published volumes (in any language) of collected works of Omar Khayyám? I'd always assumed the Rubaiyat was the magnum opus of Khayyám himself, rather than being gathered together long after his death by someone else, but am I wrong?