Question: Nevill Coghill wrote a modern English version of a work by which English poet of the Middle Ages?

Context paragraphs:
List of states during the Middle Ages: Post-classical history (also called the Post-classical Era is the period of time that immediately followed the end of ancient history.  Depending on the continent, the era generally falls between the years AD 200-600 and AD 1200–1500.  The name of this era of history derives from classical antiquity (or the Greco-Roman era) of Europe.  Though, the everyday context in use is reverse (such as historians reference to Medieval China).  In European history, "post-classical" is synonymous with the medieval time or Middle Ages, the period of history from around the 5th century to the 15th century.  It began with the collapse of the Western Roman Empire and merged into the Renaissance and the Age of Discovery.  The Middle Ages is the middle period of the three traditional divisions of Western history: Antiquity, Medieval period, and Modern period.  The Medieval period is itself subdivided into the Early, the High, and the Late Middle Ages.

Geoffrey Chaucer: Geoffrey Chaucer ( ; c. 1343 – 25 October 1400), known as the Father of English literature, is widely considered the greatest English poet of the Middle Ages.  He was the first poet to be buried in Poets' Corner of Westminster Abbey.

Nevill Coghill: Nevill Henry Kendal Aylmer Coghill (19 April 1899 – 6 November 1980) was an English literary scholar, known especially for his modern English version of Geoffrey Chaucer's "Canterbury Tales".

Doctor Faustus (1967 film): Doctor Faustus is a 1967 film adaptation of Christopher Marlowe's "The Tragical History of Doctor Faustus", written in 1588.  The first theatrical film version of a Marlowe play, it starred and was directed by Richard Burton, (Nevill Coghill, Burton's mentor, is also given credit for directing), who played the title character Faustus.  Elizabeth Taylor made a silent cameo appearance as Helen of Troy, an appearance at which critics of the day invariably sneered.

Changes to Old English vocabulary: Many words that existed in Old English did not survive into Modern English.  There are also many words in Modern English that bear little or no resemblance in meaning to their Old English etymons.  Some linguists estimate that as much as 80 percent of the lexicon of Old English was lost by the end of the Middle English period, including a large number of words formed by compounding, e.g. "bōchūs" ('bookhouse', 'library'), yet we still retain the component parts 'book' and 'house'.  Certain categories of words seem to have been especially vulnerable.  Nearly all words relating to sexual intercourse and sexual organs were supplanted by words of Latin or Ancient Greek origin.  Many, if not most, of the words in Modern English that are used in polite conversation to describe body parts and bodily functions are of Latin or Greek origin.  The words which were used in Old English for these same purposes are now mostly either extinct or considered crude or vulgar, such as arse/ass.

Middle Ages: In the history of Europe, the Middle Ages or Medieval Period lasted from the 5th to the 15th century.  It began with the fall of the Western Roman Empire and merged into the Renaissance and the Age of Discovery.  The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity, the medieval period, and the modern period.  The medieval period is itself subdivided into the Early, High, and Late Middle Ages.

The Squire of Low Degree: The Squire of Low Degree, also known as The Squyr of Lowe Degre, The Sqyr of Lowe Degre or The Sqyr of Lowe Degree, is an anonymous late Middle English or early Modern English verse romance.  There is little doubt that it was intended to be enjoyed by the masses rather than the wealthy or aristocratic sections of society, and, perhaps in consequence of this, it was one of the better-known of the English romances during the Elizabethan and Jacobean eras, and again in the 19th century.  There are three texts of the poem: it was printed by Wynkyn de Worde c. 1520 under the title "Undo Youre Dore", though only fragments totalling 180 lines survive of this book; around 1555 or 1560 another edition in 1132 lines was produced by William Copland; and a much shorter version, thought to have been orally transmitted, was copied into Bishop Percy's Folio Manuscript around the middle of the 17th century.  The precise date of the poem is unknown, estimates varying from 1440 to 1520, but Henry Bradley's date of c. 1475 has been quite widely adopted.  Standing as it does at the very end of the English Middle Ages it has been called "a swan song of the romance".

Thorn with stroke: Ꝥ (minuscule: ꝥ), or Þ (thorn) with stroke was a scribal abbreviation common in the Middle Ages.  It was used for Old English "þæt" (Modern English "that"), as well as Old Norse "þor-", the "-þan"/"-ðan" in síðan, "þat", "þæt", and "þess".  In Old English texts, the stroke tended to be more slanted, while in Old Norse texts it was straight.  In Middle English times, the ascender of the "þ" was reduced (making it similar to the Old English letter Wynn, ƿ), which caused the thorn with stroke abbreviation ( ) to be replaced with a thorn with a small "t" above the letter ( ).

Late Middle Ages: The Late Middle Ages or Late Medieval Period were the period of European history generally comprising the 14th and 15th centuries (c. 1301–1500).  The Late Middle Ages followed the High Middle Ages and preceded the onset of the early modern era (and, in much of Europe, the Renaissance).

Friesian horse: The Friesian (also Frizian) is a horse breed originating in Friesland, in the Netherlands.  Although the conformation of the breed resembles that of a light draught horse, Friesians are graceful and nimble for their size.  It is believed that during the Middle Ages, ancestors of Friesian horses were in great demand as war horses throughout continental Europe.  Through the Early Middle Ages and High Middle Ages, their size enabled them to carry a knight in armour.  In the Late Middle Ages, heavier, draught type animals were needed.  Though the breed nearly became extinct on more than one occasion, the modern day Friesian horse is growing in numbers and popularity, used both in harness and under saddle.  Most recently, the breed is being introduced to the field of dressage.

Supporting paragraphs: Nevill Coghill Geoffrey Chaucer
Answer: Geoffrey Chaucer