The mystery of Ketetiya's blue pearl (1)

A first introduction to the geography and history of Ethiopia. The archaeological site of Ketetiya. The Ketetiya blue pearl and its Indo-Pacific origin. Global history and connections : what are we talking about ? Regimes of connectivity: definition. The Catalan Atlas (1375) : what the map tells us about the flow of information that makes it possible. The Middle Ages are a geography : the Dar al-Islam. New commercial and religious fronts : Ethiopia and Nubia. Saharan and oceanic shores : parallels and false parallels. The " Sahara " is not a " Mediterranean ".