It was discovered by Leonardo Fibonacci in Bogia when he travelled around with his father.
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That would be the Hindus. The Western Arabs introduced the system to Europe, hence the term Hindu-Arabic numerals.
The numerals were introduced into Europe around the 10th century.
In medieval Western Europe the numeracy system was Roman then in the Middle Ages the Hindu-Arabic numeracy system was introduced.
The Roman numerals LXVII=67 in Hindu Arabic numerals.
The Roman numerals of CCX are the equivalent of 210 in Hindu-Arabic numerals.