My friend Luanne shared a surprise. The phrase “the Milky Way” first appears in Geoffrey Chaucer’s The House of Fame (c. 1380):
“Now,” quod he thoo, “cast up thyn yë.Why Galaxie? The OED explains: “post-classical Latin galaxias Milky Way.”
Se yonder, loo, the Galaxie,
Which men clepeth the Milky Way,
For hit ys whit (and somme, parfey,
Kallen hyt Watlynge Strete)”
Why Milky Way? The OED explains: “after classical Latin lactea via.”
And why Watlynge Strete? My ancient edition of Chaucer (ed. F.N. Robinson, 1957) explains:
Watlynge Strete, a famous old road, which probably ran from Kent to the Firth of Forth. The Milky Way was called “Watling street” or “Walsingham way” in England, just as it was known in southern Europe as “la via di San Jacopo” (the way to Santiago) and “la strada di Roma” (the way to Rome).Richard Abbott offers a correction about Watling Street in the comments: “Modern thinking, based on Roman route itineraries, is that it actually goes from Kent roughly north-west through London to Wroxeter.” He adds much more about Watling Street. Here’s a modern-day journey on the street. And from the BBC, “The road that led to 1,000 stories.” Among them: The Canterbury Tales.
[“Now,” quoth he, “cast up your eye. See yonder, lo, the Galaxy, which men call the Milky Way, for it is white (and some, by my faith, call it Watling Street).”]