1170 - Born in Pisa. An Italian mathematician who wrote "Liber abaci" (“Book of the Abacus”).
1202 - Wrote Liber abaci (“Book of the Abacus”), the first European work on Indian and Arabian mathematics.
- The discoverer and eponym of Fibonacci sequence.
1225 - He dedicated his Liber quadratorum (“Book of Square Numbers”) to Frederick.
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