Diocletian

At first sight it looked somewhat suspicious (even before reading your question), especially the obverse. But I would refrain from a final judgement without seeing it close up.

Did some research, he was wrong, it is a RIC V 162 or Sear 3516.

Since you have raised the question re authenticity, I would suggest you have a close look at the edge, with a powerful loop. Examine for:
evidence of a filed off casting sprue,
Circumferential (not radial) edge split.
What is the surface is like INSIDE those tiny radial splits (casting cannot replicate the metal stress detail found on the surface inside a genuine split).

The style seems to be OK, the patina looks to be authentic, and the tiny amount of verdigris supports this.

The lettering and image DO look a little mushy, indicating a 2nd or 3rd generation copy (cast OR struck), but that by itself is NOT enough to condemn it. Worn dies can create a similar effect.