Roman Numeral Year Dates : a conversion guide
http://rbms.info/standards/index.shtml
| 1 -- 16 | 17 -- 500 | 600 -- 1,000,000 |
| 1............I | 17............XVII | 600............DC |
| 2............II | 18............XVIII | 700............DCC |
| 3............III | 19............XIX or XVIIII or IXX | 800............DCCC |
| 4............IV | 20............XX | 900............CM or DCCCC |
| 5............V | 30............XXX | 1000...........M |
| 6............VI | 40............XL or XXXX | 2000...........MM |
| 7............VII | 50............L | 3000...........MMM |
| 8............VIII | 60............LX | 4000...........MV or MMMM |
| 9............IX | 70............LXX | 5000...........V |
| 10...........X | 80............LXXX | 10,000.........X |
| 11...........XI | 90............LXXXX or XC | 25,000.........XXV |
| 12...........XII | 100...........C | 50,000.........L |
| 13...........XIII | 200...........CC | 100,000........C |
| 14...........XIV | 300...........CCC | 500,000........D |
| 15...........XV | 400...........CD or CCCC | 1,000,000.....M |
| 16...........XVI | 500...........D |