When were Roman numerals first used?

Answer 1

During the period of the Etruscan occupation and rule of Rome.
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Roman numerals evolved over a long period, but are thought to have derived from the Etruscan tally-stick method of counting, However the Etruscans inherited from the Greeks, placing it as early as the 8th century BCE. It is not known when the system we use today first came into use, however the Middle Ages saw a change in the notation that replaced D and M with modifications to their original symbols to allow a greater range of numbers (millions) than the standard notation permits (1-3999). This notation is seldom used, however, as Roman numbers are typically only used for values below 4000 (which is more than adequate to denote a year in the common era).
Roman numerals were first used around the 4th century BC, although the system we're familiar with today didn't appear until around the 1st century AD.

[EDIT: irrelevant to question] The numbers we use today (0,1,2,3,4,5,6,7,8,9) are called Arabic Numerals. They were first used by the Chinesse people of China long ago as 3000BC. Over time they were refined and the all important 'zero' was developed. The Arabs were the bridge that brought this numbering system over to Europe from the 600's onwards. The earliest record we have of their use in Europe is in 976. Because the Europeans learn't of this system from the Arabs they became known as Arabic numerals. and this information is from copper ridge school in AZ...... :):):)
People are not Barry nice