Old English encountered Y through Christian missionaries who brought Latin texts to the British Isles. Anglo-Saxon scribes used Y to transcribe their native rounded vowel sound, distinct from both I and U. Over time, the Great Vowel Shift and regional dialect leveling stripped English of this rounded vowel. By the Middle English period, Y had phonetically merged with I.
This convergence sparked confusion among copyists. Scribes increasingly substituted Y for I to improve legibility in handwritten gothic script, where clusters of vertical strokes, known as minims, made words like minim or him nearly unreadable. Writing hym instead solved visual ambiguity on parchment.
The letter also became tangled with native Germanic runes. English scribes relied on the runic character thorn (Þ, þ) to produce the "th" sound. When continental printing presses arrived in England during the late 15th century, William Caxton and his peers discovered their imported Dutch and German typecases lacked the thorn character. Printers substituted the closest visual match they owned: the lowercase letter y. As a result, historical spellings like ye in early modern printing were pronounced as the, generating the modern misconception of "Ye Olde Shop."
