His real name was Leonardo Pisano Bogollo, and he lived between 1170 and 1250 in Italy."Fibonacci" was his nickname, which roughly means "Son of Bonacci".As well as being famous for the Fibonacci Sequence, he helped spread Hindu Arabic Numerals (like our present numbers 0,1,2,3,4,5,6,7,8,9) through Europe in place of Roman Numerals (I, II, III, IV, V, etc).

Fibonacci was not the first to know about the sequence, it was known in India hundreds of years before!The 1228 edition, first section introduces the Hindu-Arabic numeral system and compares the system with other systems, such as Roman numerals, and methods to convert the other numeral systems into Hindu-Arabic numerals. Replacing the Roman numeral system, its ancient Egyptian multiplication method, and using an abacus for calculations, with a Hindu-Arabic numeral system was an advance in making business calculations easier and faster, which led to the growth of banking and accounting in Europe.Fibonacci Day is November 23rd, as it has the digits "1, 1, 2, 3 which is part of the sequence. So next Nov 23 let everyone know!

This is Fibonacci sequence. It always maintain this rules. You can see Fibonacci numbers in Flower, spiral etc
Also By divide this number with the previous number you will get the result which is very close to the GOLDEN RATIO.

His importance of Fibonacci’s work is often overlooked. His work made arithmetic

accessible in a revolution that was a vital force of transformation of many everyday

aspects of life. His new understanding of number structures also had a huge impact not

only on the development of mathematics but on science too. Interestingly, while he is

probably best remembered for his famous sequence of numbers, he only dealt with this

discovery in brief.While Fibonacci did not pursue the study of mathematical properties

in his sequence, this task was taken up by others. For example, a French

mathematician by the name of Francois Lucas led a substantial body of

mathematicians in the nineteenth century who studied the Fibonacci sequence in great

deta.