Who wrote the first book
The first recorded book was written in ancient china by a woman in a rich family as instruction for other women in other families.
Books have been around for so long, no one knows.
There is no record for it.
It's not the first book, but the first novel is believed to be The Tale of Genji. Possibly the oldest literature is "Gilgamesh".
Speculation is that the first books were hand written bibles.