https://en.wikipedia.org/wiki/Traditional_English_pronunciation_of_Latin
The traditional English pronunciation of Latin, and Classical Greek words
borrowed through Latin, is the way the Latin language was traditionally
pronounced by speakers of English until the early 20th century.
In the Middle Ages speakers of English, from Middle English onward,
pronounced Latin not as the ancient Romans did, but in the way that had
developed among speakers of French. This traditional pronunciation then
became closely linked to the pronunciation of English, and as the
pronunciation of English changed with time, the English pronunciation of
Latin changed as well.
Until the beginning of the 19th century all English speakers used this
pronunciation, including Roman Catholics for liturgical purposes.[1]
Following Catholic emancipation in Britain in 1829 and the subsequent Oxford
Movement, newly converted Catholics preferred the Italianate pronunciation,
which became the norm for the Catholic liturgy. Meanwhile, scholarly
proposals were made for a reconstructed Classical pronunciation, close to the
pronunciation used in the late Roman Republic and early Empire, and with a
more transparent relationship between spelling and pronunciation.