Leonardo Fibonacci was an Italian mathematician who is most famous for introducing Fibonacci sequence. He is also known as Leonardo of Pisa. Leonardo was believed to be the most gifted mathematician of the middle Ages. He was born around 1170 in Pisa, Italy.

His father Guglielmo Bonacci was an Italian merchant. He was brought up in Bougie, Algeria, where his father was a warehouse official. Leonardo Fibonacci was the first European to work on Indian and Arabian mathematics.

**Quick Facts: –**

- In 1202, Leonardo Fibonacci wrote a book Liber Abaci that introduced the Hindu and Arabic numeral systems.
- He wrote Practica geometriae in 1220 CE, focusing on geometry problems and Flos in 1225 CE, in which he analyzed various mathematical problems.
- In 1225, he authored Liber quadratorum and dedicated it to the Holy Roman emperor Frederick II.
- He worked with Frederick II and his scholars for several years, exchanging problems with them.
- He traveled around the Mediterranean to Egypt, Greece, Sicily, Southern France, and Syria, learning more mathematics.
- A number sequence has been named after him, as Fibonacci Sequence. This sequence is used to solve different computer science problems today.
- He mentioned the rabbit population puzzle in his book Liber Abaci which can be solved by using Fibonacci sequence.
- In this sequence, the next number is calculated by adding the previous two numbers. It goes like 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, and so on.
- The exact date is not known but it is believed that he died sometime after 1240.