Where did they live?
Who were they?
Where did they go?
Throwing up another source that does nothing to support your contention just makes you look like more of a fool.
And you pinged me why?
FWIW, ....
The Catholic Church didn't come into existence until the third century. Any population of Christians would have been of necessity non-Roman Catholic or non-Byzantine.
Throughout the Middle East and North Africa and the Roman Empire.
Who were they?
Ordinary people; Jews, Gentiles, Romans.
Where did they go?
They probably died like everybody else. What other kind of answer are you looking for because that question makes no sense?
There were seven churches mentioned in the Book of Revelation and they all died out, but Christianity continued. It doesn't need a church to do that.