Mozart was involved with Freemasonry, though. Is he roughly contemporaneous? The plot of “The Magic Flute,” they say, is based on Masonic rituals.
I don’t see Byron as that much of a joiner, but on the other hand, he did want to do anything if it was transgressive.
And what was allowable on the continent, (those foreigners you know) and what was allowable in Merrie ol England was two different things.