An early debate on the question took place in the 9th century, after Charles the Bald had posed the question if the body and blood of Christ were to be a mystery of faith, or if they were truly present (in mysterio fiat an in veritate).
Perbedaan pendapat seputar pertanyaan tersebut terjadi pertama kali pada abad ke-9, setelah Karl II mengajukan pertanyaan apakah tubuh dan darah Kristus merupakan suatu misteri iman, atau apakah benar-benar hadir (in mysterio fiat an in veritate).