Which medieval poem did J.R.R. Tolkien translate with E.V. Gordon in a 1925 edition?

J.R.R. Tolkien translated Sir Gawain and the Green Knight with E.V. Gordon in an edition published in 1925. The work is a major Middle English poem about an Arthurian knight facing a supernatural challenge.

Tolkien and Gordon’s edition provided the Middle English text, scholarly notes, and a glossary. Their work reflected Tolkien’s academic expertise in medieval languages and literature, especially the language and poetry of the English Middle Ages.

The poem is often grouped with Pearl and Patience because all are associated with the same anonymous poet, sometimes called the Pearl Poet. However, Tolkien’s 1925 collaborative edition was specifically devoted to Sir Gawain and the Green Knight.