Espero, by Robert Gyemant ... who happens to be my next door neighbor.
It's about a ("Guinea") boy taken from Africa by Spanish slavers, sold to a Jewish woman who gives him to her brother, a doctor. The doctor treats Espero as his son until he is betrayed to the Inquisition -- this takes place about the time of the death of Fernando of "Ferdinand and Isabella" fame -- spends years back in chains, and (about halfway through the book) is now in Florida, valuable to the Spaniards running the expedition because he happened to learn the local language years ago. It's interesting, but there's a certain amount of infodump of the "I did all this research and now you get the benefit of it" variety.
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