Probable roman coin [solved]

Hello all, I don't really collect Roman coins but I have this unidentified one. Really unsure where to start! Seems to be some text and one side seems to be a soldier, but it's not super high quality. Any pointers welcome!

Check out this website, it's the closest I found, but it should get you started on the right road, there were a lot of pictures to compare to. 

https://numismatics.org/ocre/id/ric.4.ss.674

I do think your second picture is a head with a crown (the pointy things are the crown) and the letters would be at the top. 

Hope it helps get you on the path to finding your solution!!

I think the reverse inscription is : MARTI (PACIF(ERO) the inscription in the brackets is a guess of mine

The ruler is Gallienus (inscription GALLIENVS)

A similar coin: N#289148

Maybe your coin is under them: https://en.numista.com/catalogue/index.php?e=rome_section&r=MARTI+gallienus&ct=coin&im1=&im2=&tb=y&tc=y&tn=y&tt=y&tp=y&cat=y&ru=&ca=3&no=&v=&i=&b=&ie=&u=&a=&dg=&m=&f=&t=&w=&mt=&g=&se=&d=&c=&wi=&sw=

Maybe its this coin: N#62593 with the H letter variants

Wow, thank you both. The N#62593 reverse seems pretty much bang on, with a H as mentioned, and the IIII form M. The obverse doesn't line up exactly, but there are some very close although not identical matches on https://numismatics.org/ocre/results?q=deity_facet%3A%22Mars%22%20AND%20portrait_facet%3A%22Gallienus%22&start=40 so happy to conclude it's Gallienus as suggested. Very very appreciated!