Great find with the Hanniballianus Archraz 
Its always nice when someone finds something rare and unusual.
I think Doug is correct and #4 is Gallienus, I think its the same as the below coin:

GALLIENVS AVG - Radiate head right SALVS AVG - Salus standing right feeding serpent in arms, XII in right field 265-267 AD - RIC only lists this coin as having 'XII' in the left field - RIC V part 1, 274a, page 155.
During research I found this great site (its where the pictures come from): http://mk.shahrazad.net/gallienus/ Certainly worth adding to favourites for future reference 
Its always nice when someone finds something rare and unusual.
I think Doug is correct and #4 is Gallienus, I think its the same as the below coin:




















