For the top image, bottom left is Trajan, and the one in the center of the top row is most likely Vespasian. Outside of that, I have no clue as they are fairly worn.
The one on the upper right appears to be Constantine II, the reverse reads "GLORIA EXCERCITVS" or the "Glory of the Army". It's a pretty common type.
The one on the center top appears to be Domitian, based on a careful reading of what's left of the legend.
