Yeah, I know that other texts had been translated before it, but I'm not sure they would qualify as a "book".
Discussion
Agreed. First book? Yeah, I could see it. Hebrew Bible/OT for sure. Took till 397AD to canonize the New Testament, but all books were in use prior to that, possibly forming around 300AD.
The real mind-bender to me is that the Church survived for 200-300 years prior to this. An Eastern Orthodox priest clued me into this.