The Archivo General de Simancas (AGS) is the primary central archive of the Hispanic Monarchy for documents from the sixteenth to eighteenth centuries, although it also holds documents dating from the medieval period. It is located in the fifteenth-century castle of Simancas in a small village of the same name, ten kilometers from Valladolid. It is a valuable repository not only for the study of early modern Iberian empires, but also for North Africa and the Mediterranean.