What was the name of Tolkien’s scholarly edition with E.V. Gordon?

Tolkien’s major scholarly edition with E.V. Gordon was Sir Gawain and the Green Knight.

The edition was published in 1925, while Tolkien was at the University of Leeds. Gordon was the principal editor, and Tolkien contributed expertise in Middle English language and literature. The work helped establish the poem as an important subject for modern academic study and remains influential among readers of medieval literature.

Sir Gawain and the Green Knight is a late-fourteenth-century Arthurian romance written in Middle English. It follows Sir Gawain, a knight of King Arthur’s court, through a test of courage, honor, truthfulness, and courtesy. The poem’s alliterative style and detailed descriptions made it especially valuable to Tolkien as both a scholar and a writer.

The title is sometimes confused with Tolkien’s own fantasy fiction because he later published a translation of the poem. His translation appeared posthumously in 1975, alongside translations of Pearl and Sir Orfeo.