Who are the historical figures who are (1) best known in the Western world, and (2) did most or much of what made them famous while what is now Morocco, Algeria, or Tunisia was their home? I have one person in mind for each country, though there might of course be important rivals in each country, and for all I know there could be some who did much of their work in two or more of the countries.
Note that I ask here about people who are most well known in the Western world. I can't speak to who is most known within those countries, or in the Middle East. Also, of course many of these people are well known in the Western world despite not being widely known to have lived in those countries (or else what would be the point of the puzzle?). Rick doesn't count.