When in Rome, replace every instance of the letter "u" with "v".
In Ancient Rome, there were many stone engravings. They were almost as common as written paper, if not more so. Now, this created some problems, becavse it's difficvlt to neatly carve a cvrvy line. The Romans remedied this by replacing instances of the letter "u" with "v". They didn't have the letter v in writing, either. Becaves of this, it has become a bit of a Stock Parody to do this in ancient Roman settings (or Greek, if the avthors feel like taking a bit of artistic license).