Why did Fibonacci become famous?

Fibonacci became famous primarily for introducing the Fibonacci sequence to the Western world through his book "Liber Abaci" published in 1202. This sequence, where each number is the sum of the two preceding ones, has fascinating mathematical properties and appears in various natural phenomena. His work also popularized the use of Hindu-Arabic numerals in Europe, significantly influencing mathematics and commerce. As a result, Fibonacci's contributions laid important groundwork for future mathematical developments.