@la_biografia I was just about to write that. No other institution systematically researched, analyzed, and accumulated the Middle Ages of Japan like the Jesuits. E.g.,

@la_biografia E.g., "HEIKE Monogatari (The tale of HEIKE, meaning the tale of TAIRA clan)", which they translated in the 16th century, it was described as ”FEIQE Monogatari”. There is no material other than what Jesuits left behind to convey the pronunciation of medieval Japanese. 📖