Giobruno
Identifying emperors solely by a worn out portrait is not my strong, but they all look Constantinian period.
By the way, in #1 and #2 I can't enlarge the photos.
On #1 I think I can read CONS(…), and the reverse certainly looks like a VOT (insert number) type.
On #2 and #3, you already did the bulk of the job.
For #2 we can still try to determine the emperor, but for the reverses of the two I think we can't go further than that with the few to none letters remaining, the mintmarks looks lost.
On #4, with the two Victories at the reverse the type looks certainly VICTORIAE DD AVGG Q NN.
The portrait looks to be reasonably visible but the letters are gone (except perhaps a CO… at the beginning). On the reverse, nothing readable, so the mintmark is lost.
Fixed the zoom.
In the #1, here in my hands I can see the AVG, and on the other side, the last letter looks like an A.
In #2, I think you can see now with zoom, there's an something like "TE A" in mint mark. Maybe can be “TESA” from Thessalonica.
Here other photo of the #2 with the name of the emperor.

In the #4, here in my hands, i cant see anything that can help too. Maybe an A on the left in the mint mark.