WHAT AND WHERE IS THE KINGDOM OF LOGRES?

I've been asked about this privately, so am putting here a short passage from my book THE BEAR KING.

***

The Welsh name for England – Lloeg(y)r – , found in the French romances as Logres, would support the contention that the South had remained Romanized. While various Celtic derivations have been sought for this word, it seems to me pretty clearly to be from the Latin genitive plural laicorum (m.)/laicarum (f.)/laicorum (n.), from laicus, “of or belonging to the people or laity, not priestly, not consecrated.”  If people living in the region concerned were laity, then they were Christian.  Not priests, but also not pagans.