They already told you hahaha... roman numeral converter, on google! That's part of education nowadays Google.
That is both good and bad. It's good if you google it and learn it, because there are just a few letters and it's really simple. Bad if you use it constantly, instead of learning it. Back in my day, you had to know Roman numbers, there was no exception from that.
You're right, old documents have their own mystery and it's nice to see them. It's history.
😁
I just can't learn all the Roman numerals. I only know X, V... hahaha and I.