Some Strange Places

Poul Anderson Appreciation takes us to some strange places. We have often discussed Latin, more recently Roman numerals because Anderson mentioned 52,300 Roman soldiers and 15,000 Cimbrian horses. I have tried to find the Belgian monument with the incorrect "CCCC" for 400. However, the monument in the above image gets it right: MDCCCXXXI = 1831.

15,000 would have to be 15 M's. 52,300 would have to be 52 M's followed by XXX but this just proves that it is getting very late at night. I keep typing the numbers wrong.