The poem written by William Langland?

William Langland is most famous for writing "Piers Plowman", a long, allegorical poem that explores themes of social injustice, religious hypocrisy, and the search for truth.

While "Piers Plowman" is his most well-known work, Langland also penned several other poems, including:

* "The Vision of William concerning Piers the Plowman" - a shorter version of "Piers Plowman"

* "The Vision of William concerning Piers the Plowman: Passus IV to VII" - a section of "Piers Plowman"

* "The Vision of William concerning Piers the Plowman: Passus VIII to XX" - another section of "Piers Plowman"

* "The Vision of William concerning Piers the Plowman: Passus XXI to XXIII" - the final section of "Piers Plowman"

However, it's important to note that there is a significant debate among scholars regarding the authorship of the different versions of "Piers Plowman". While it is generally accepted that William Langland wrote the first version, the later versions are sometimes attributed to other writers or even Langland himself but at different points in his life.

Therefore, while "Piers Plowman" is widely considered Langland's most famous work, the exact authorship of its various sections remains a topic of ongoing scholarly discussion.