Roman coin - which emperor is this? [решено]

Hello,
Quick question (I haven’t measured the coin yet)—can anyone tell me which emperor this is? I can see that the reverse is something REIPUBLICAE but I don’t think I recognize the bust...

Hello,

I don't think it's an emperor, but Helena. Mintmark PTR.
https://www.vcoins.com/en/landing/helenacoins.aspx

Thank you! No wonder why I couldn’t find a emperor’s image that matches it. And then the reverse must be SECVRITAS REIPVLICAE, I suppose.

Цитата: "Cuthwellis"​Thank you! No wonder why I couldn’t find a emperor’s image that matches it. And then the reverse must be SECVRITAS REIPVLICAE, I suppose.

​You're welcome. It is indeed.