How to format a historic date range from BC to AC

Stumbled on this little arch site in the old location Marina, part of now Silvi, a roman furnace (not in the arch site list) which says it’s somewhere from Sec. 2 a.C to 1 d.C.

Parsing what’s listed in TagInfo, took a stab at =C-2…C1 but doubt this is anywhere right to describe a period range seeing things like CE and BCE with only few entries. Added historic:civilization=roman as supplemental tag as an aside.

Tag suggestions welcome.

Look at the start_date and start_date:edtf for how to represent indeterminate dates.