Autun mosaic from The House of the Greek Authors, Musée Rolin

For some reason I just saw your post Titus. I don't know but those are great questions to research!

The lower left clearly reads ΕΠΙΚΟΥΟC (Epicurus).

The inscription above his head is PD5:

Οὐκ ἔστιν ἡδέως ζῆν ἄνευ τοῦ φρονίμως καὶ καλῶς καὶ δικαίως οὐδὲ φρονίμως καὶ καλῶς καὶ δικαίως> ἄνευ τοῦ ἡδέως·

It's Epicurus expounding the 5th of his principal doctrines.

I can't tell whether the engraved letters were present with the mosaic, but even if not, the letters line up perfectly with the text of his name and of PD5.

See also https://mosaic-blues.com/blog/2020/12/1…phers-in-autun/

And also a mosaic of Metrodoros in Autun!

Yes it is interesting how Metrodorus apparently achieved some stature in his own right.