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The Middle Ages
Integers were first used before the AD period in history. It is believed they were originated from Latin origins and developed after that time.
medival times
BC = before christ AD = Anno Domini (year of our Lord) we are in the year 2011, time before year 1 was BC time afterwards (what we live in) is AD
They were used through the history of the Roman Era, from roughly 800 BC until 300 AD. They continued in limited use in Europe following the collapse of the Roman Empire.