Your coins from left to right are--
Galerius
A.D. 302- 303
MAXIMIANVS NOBIL C; laureate and cuirassed bust right.
GENIO POPV-LI ROMANI; Genius standing left, modius/tower on head, naked but for chlamys over left shoulder, right holding patera, left cornucopiae; S-F across fields.
In ex. II TR
RIC VI Trier 508b/ 530b
This coin is either RIC VI Trier 508b or 530b, depending on whether Genius is wearing a tower or a modius. The distinction is often not clear and seems rather arbitrary.
Galerius
A.D. 302- 303
GAL VAL MAXIMIANVS NOB CAES; laureate head right.
GENIO POPV-LI ROMANI; Genius standing left, modius on head, naked but for chlamys over left shoulder, right holding patera, left cornucopiae; Δ in right field.
In ex. • TS •
RIC VI Thessalonica 26b
Maximinus II
A.D. 308- 310
IMP C GAL VAL MAXIMINVS P F AVG; laureate head with divergent wreath ties.
GENIO IMPERATORIS; Genius standing left, holding patera & cornucopiae; K in left, A over P right.
In ex. ALE
RIC VI Alexandria 103