This happened to Arthur, Prince of Wales and Catherine of Aragon. They both had studied Latin, so they could communicate over letters. But their pronunciation was so different they couldn’t speak to each other.
the couple soon discovered that they had mastered different pronunciations of Latin and so were unable to easily communicate.[40]
This happened to Arthur, Prince of Wales and Catherine of Aragon. They both had studied Latin, so they could communicate over letters. But their pronunciation was so different they couldn’t speak to each other.
https://en.wikipedia.org/wiki/Arthur,_Prince_of_Wales