Fibonacci of Pisa
lived from
1170 to 1250

Leonard of Pisa or Fibonacci played an important role in reviving ancient mathematics and made significant contributions of his own. Liber abaci introduced the Hindu-Arabic place-valued decimal system and the use of Arabic numerals into Europe. The Fibonacci numbers occur in one of his problems.

See more at:   http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Fibonacci.html