Two Letter Roman Numerals

Now to nitpick: You may want to add a caveat that you are using standard notation numerals only. Roman numerals were used for a long time across a large area (by human historical-era standards, at least) and there was wide variation. Just like spelling can vary across times (think Chaucer vs now) or geography (color vs colour) what is "right" was based on local convention. While uncommon, the use of "IL" for 49 or "IC" for 99 and other subtractive nation have been recorded and would be understood in the Roman world. (ex. https://archive.org/details/publiclatin00kennrich/page/150/mode/2up) Similarly, there are cases of not using subtractive notation where expected, such as the Colosseum using LIIII for Gate 54. A note at the top of the quiz will hopefully stop other pedantic comments!