Fibonacci
![A page of Fibonacci's Liber Abaci from the Biblioteca Nazionale di Firenze showing (in box on right) the Fibonacci sequence with the position in the sequence labeled in Roman numerals and the value in Hindu-Arabic numerals.](/Images/godic/202501/13/Liber_abbaci_magliab_f124r3402.jpg")
![19th century statue of Fibonacci in Camposanto, Pisa.](/Images/godic/202501/13/Leonardo_da_Pisa3402.jpg")
Leonardo Bonacci (c. 1170 – c. 1250)—known as Fibonacci (Italian: [fiboˈnattʃi]), and Leonardo of Pisa, Leonardo Pisano Bigollo, Leonardo Fibonacci—was an Italian mathematician, considered to be "the most talented Western mathematician of the Middle Ages".