California has long been associated with fantasy, but few people know that centuries before Hollywood, it drew its very name from an imaginary kingdom—one ruled by a Black queen. Around 1530, when Hernán Cortés’s conquistadors, amid shipwrecks, mutinies, and the destruction of the Aztec Empire, arrived at the peninsula on Mexico’s western side, they christened it “California,” after a fictional island in a Spanish book published decades earlier. The name, later extended from the peninsula (now Baja California) to the mainland coast to the north, endured, surviving the region’s incorporation…