When was The Faerie Queene created?

The Faerie Queene was written and published in stages over a long period:

* First published: 1590

* Completed: Edmund Spenser died in 1599 before completing his intended 12 books. Only the first nine cantos of Book IX were completed.

So, while the earliest parts were published in 1590, the project was ongoing until Spenser's death in 1599.