Mustaches in the praetorian guard

[Robert Vermaat]

Caracalla is portrayed with a neat moustache and only the merest sketch of a beard.
http://www.metmuseum.org/toah/images/hb/hb_40.11.1a.jpg
A tache and designer stubble, more or less.

It's not a moustach, it's clearly connected to the beard.

I thought that moustaches were unknown during the Roman period, there's even a theory that it was later referred to as a 'Gothic beard'. But last Saturday in Antwerp I came across a Fayum portrait of a man with a clear moustache and not even a hint of a beard.