I thinking how does one say "Hello, how are in? latin, and the first thing that came to mind was "salvete, quōmodo stas?" but then I realized that stare didn't mean "to be" in classical Latin. So I'm wondering when did Latin stare take on the meaning "to be" instead of "to stand." I would think this would have taken place by the 5th or 6th century as it's common to all romance languages, does it show up with this meaning in any literature, Roman plays or graffiti with that meaning earlier then that time?