1170 - 1240

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Fibonacci (; also US: , Italian: [fiboˈnattʃi]; c. 1170 – c. 1240–50), also known as Leonardo Bonacci, Leonardo of Pisa, or Leonardo Bigollo Pisano ('Leonardo the Traveller from Pisa'), was an Italian mathematician from the Republic of Pisa, considered to be "the most talented Western mathematician of the Middle Ages".The name he is commonly called, Fibonacci, was made up in 1838 by the Franco-Italian historian Guillaume Libri and is short for filius Bonacci ('son of Bonacci'). However, even earlier in 1506 a notary of the Holy Roman Empire, Perizolo mentions Leonardo as "Lionardo Fibonacci".Fibonacci popularized the Indo–Arabic numeral system in the Western world primarily through his composition in 1202 of Liber Abaci (Book of Calculation). Read more on Wikipedia

Since 2007, the English Wikipedia page of Fibonacci has received more than 2,903,785 page views. His biography is available in 111 different languages on Wikipedia (up from 110 in 2019). Fibonacci is the 14th most popular mathematician (down from 12th in 2019), the 58th most popular biography from Italy (up from 62nd in 2019) and the 2nd most popular Mathematician.

Fibonacci is most famous for the Fibonacci sequence, which is a sequence of numbers that starts with 0 and 1. The sequence progresses by adding the previous two numbers to get the next number.

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Among mathematicians, Fibonacci ranks 14 out of 823Before him are Euclid, Hypatia, Bertrand Russell, Al-Biruni, Bernhard Riemann, and Pierre de Fermat. After him are John Forbes Nash Jr., Pierre-Simon Laplace, John von Neumann, Joseph-Louis Lagrange, Henri Poincaré, and Diophantus.

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Among people born in 1170, Fibonacci ranks 1After him are Saint Dominic, Valdemar II of Denmark, Wolfram von Eschenbach, Walther von der Vogelweide, Constantine Laskaris, Hermann von Salza, Isabella of Hainault, Muqali, Jayadeva, Otto I, Count of Burgundy, and Pierre de Castelnau. Among people deceased in 1240, Fibonacci ranks 1After him are Ibn Arabi, Razia Sultana, Raymond Nonnatus, Constance of Hungary, Konrad von Thüringen, Jacques de Vitry, Chormaqan, Llywelyn the Great, and Skule Bårdsson.

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In Italy

Among people born in Italy, Fibonacci ranks 58 out of 4,668Before him are Pope Pius XII (1876), Evangelista Torricelli (1608), Claudio Monteverdi (1567), Sophia Loren (1934), Empedocles (-490), and Federico Fellini (1920). After him are Lucretius (-94), Pope Clement VII (1478), Umberto Eco (1932), Guglielmo Marconi (1874), Vespasian (9), and Antonio Stradivari (1644).


Among mathematicians born in Italy, Fibonacci ranks 2Before him are Archimedes (-287). After him are Joseph-Louis Lagrange (1736), Luca Pacioli (1445), Gerolamo Cardano (1501), Archytas (-428), Maria Gaetana Agnesi (1718), Philolaus (-470), Niccolò Fontana Tartaglia (1499), Giuseppe Peano (1858), Bonaventura Cavalieri (1598), and Lodovico Ferrari (1522).