Can anyone tell me who this is please?

This (half) coin has some (legible) legend and I am hoping that someone will recognize enough from what is visible to help me to attribute this coin, please?
AE 21.3mm., and 3.72 gm (if it was a whole coin).




(Different lighting.)

 

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Aurelian. Cyzicus with C * P in exe. ?. Possibly PRINCIPI IVVENTVTIS? I can't make enough of the reverse legend out to say more.

 

I was going to say Gallienus but I think it is instead Aurelian as @maridvnvm states.

 

Thank-you, @maridvnvm .
I am pleased that you were able to get what you could from this. It helps a lot.
Similar to: RIC 351 P

Aurelian AE Antoninianus. Cyzicus mint, ca 272-274 AD.
Obv: IMP AVRELIANVS AVG, radiate, cuirassed bust right
Rev: RESTITVT ORIENTIS, woman kneeling right, being raised by Aurelian holding sceptre standing left.
Mintmark C star P.
RIC 351, Cohen 204; Sear 11596.