How do we know that Marcus Aurelius actually wrote The Meditations as his journal?

by JamieOvechkin

The Meditations is a book of stoic wisdom purportedly to have been written by Marcus Aurelius that is popular in self help circles.

While certainly a popular read, what proof do we have that this book was actually written and published by Marcus Aurelius?

If it was published after his death, how was his journal discovered, and consequently distributed to those who wanted to read it?

Is there an existing original copy in Marcus Aurelius’s own writing?

psunavy03

There's a similar answer here from /u/boopoo3894 about how the manuscript survived, and it talks about its popularization by a Byzantine writer.