It is true that t<span>he first Christian images are complex and narrative.
You have to understand that this was a time when not many people actually knew how to read - reading was taught only to the rich. This is why many peasants couldn't read the Bible or be religiously educated. For this purpose, there were many Christian images which explained scenes from the Bible, giving a certain narrative to educate the crowds.
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Intaglio printmaking can be dated back to the "Sumerian" people, around the year of 3000 BCE. The name itself however is relatively new, coming from the Latin "intagliare" which means "to cut"