Help ID Please

I have to disagree, I think you were correct with:

Galerius
MAXIMIANVS NOB CAES
VOT XX theta
Rome RIC VI Rome 88b

Ignore the 'Galerius caesar struck by Maximianus' thing, I think this is just to signify that the coin was struck in the part of the Empire that was not under Diocletians control. Galerius was Diocletians Caesar where as Maximian was Augustus in the west.

This probably could do with a better explanation but not got the time right now, sorry.

oh, ok...i got it....thank you BH!

The Tetrarchy issued coins from most mints for all four rulers so there is nothing odd about a Western coin for an Eastern Caesar. At this period the four got along well and did reciprocal coins. There are times later when Constantine and Licinius issued coins for each other for a while and then stopped due to periods of bad feelings or warfare so there are some issues really rare for one and common for the other but I believe the idea of a ruler issuing coins for another is overstating the matter. Usually the mint issued coins for all legitimate rulers. The noteworthy exception is when coins were issued by a usurper in the name of the legitimate ruler as when Carausius did Diocletian and Maximianus antoniniani with the reverses ending in AVGGG suggesting the empire had three emperors.

We have to be careful to read the presence or absence of the A that separates Maximianus from Maximinus. Yes, I do have a page:
http://www.forumancientcoins.com/do...ith/max.html