The world's oldest printed book
is a religious text from 868 AD.
What is it?

Question

Accepted Answer

The Diamond Sutra — a Chinese translation of a Sanskrit Buddhist text. — Discovered in the sealed Mogao Caves in 1907. Predates Gutenberg by nearly 600 years. Now in the British Library.

The world's oldest printed book is a religious text from 868 AD. What is it?