Roman Numerals

Last month we went in search of Roman Numerals.  We've been studying ancient Rome and the lesson wouldn't be complete without learning a little bit about Roman Numerals.  I thought we might find some in this cemetery since it has some very old headstones.  I was wrong.  

 We did find this guy though.  It didn't say who it was.  He was standing over the mausoleum area.  Is that the right word for it?  I'm not sure.  Anyways, he was wearing Roman style garb and there were also leaves embossed in the stone, like what you would see on a leaf crown.

 Then we thought we might check out the cenotaph near City Hall.  With time running out we stumbled on 2 Roman Numerals tucked away nicely on the side of these two cannons.

 Can you tell what numbers they are?  Here is the information you need to know to solve this question.

I = 1
V = 5
X = 10
C = 100
D = 500

In Roman Numerals, when the same number is repeated one after the other, the numbers are added.
Ex:  X = 10,   XX = 20

When a larger number is followed by a smaller number, the numbers are added.

When a smaller number is followed by a larger number, the smaller number is subtracted from the larger if the larger is no more than 10 times the smaller.

Confused yet?  Don't want to spend the time figuring it out?  See below for answers.

 CCCXI = 311

DCCXCV = 795


Sooooo.... how did you do?  Are you a Roman Numerals whiz now?