Fibonacci

Please note that the profile portrait above is not an actual representation and instead a portrait of a modern engraving with no basis for authentication.

https://en.wikipedia.org/wiki/Fibonacci

Grew up in North Africa

Friend to Frederick II, Holy Roman Emperor

Also known as Fibonacci, Leonardo the Traveller from Pisa, Leonardo of Pisa, Leonardo Bonacci, Lionardo Fibonacci, Leonardo Pisano Bigollo

enlisted in the Pisan Republic