Look at his previous posts. He finds wonderful ancient coins all the time by metal detecting. He lives in Europe, obviously!
The Probus is a stunner. The top one is Decius; you can already see 'TRAIANVS DECIVS' along the top. ...A younger portrait than you usually see; no clue about the reverse.
...Yeah, to wallow in the obvious, it's an easy prototype of the 4th-c. 'fallen horseman' motif. With a resonant historical context, along the same lines. But, Yeah, Brilliant.
@galba68, after finally looking no further than an antiquated copy of Sear, I'm all the way to thinking you were closer than me about Hostilian. ...Or Herennius, as @Spaniard suggested. ...Thank you, for those of us showing up as late as I am, both were sons of Trajan Decius. Just takes some of us longer....