Roman number XIII to decimal

The Roman number XIII is equivalent to the number 13 (thirteen).

13
XIII

XIII = 13
The Roman numbering system (Roman numerals) was created in Ancient Rome, and was used throughout the Roman Empire. It consists of seven capital letters of the Latin alphabet: I, V, X, L, C, D and M.
Keywords: How is the number 13 in Romano, How to write 13 in Roman numerals