I'm looking to identify some Roman imperial coins (235-476AD)

​Hey everyone . I just receoved some Roman coins I was told they are from the period of 235-476 AD after some research I was able to ID most of them would appreciate any help on these four. Thank you. ​​​​​​

#1 A beautiful coin of Constantine II as Caesar.

mint: Thessalonica 320-1; Wildwinds gives a date of 324.
o. CONSTANTINVS IVN NOB C.
r. CAESARVM NOSTRORVM VOT/X
ex: TSBVI with star at top within the wreath.
RIC VII p512 #122; Sear 17195.
See: http://www.wildwinds.com/coins/ric/constantine_II/t.html

#2
Constantius II 337-361
mint ?
AE Billon reduced centenionalis
struck 342-348 AD
o. D N CONSTAN - TIVS (P F AVG)
r. VOT XX MVLT XXX within wreath
see: https://en.numista.com/catalogue/pieces147740.html

#3
Valens 364-378 AD
AE centenionalis
Constantinople mint
o. D N VALENS P F AVG
r. GLORIA ROMANORVM
Valens advancing r., dragging captive by hair with r. hand and holding labarum in l.
ex: CONS…

#4
Issue of Constantine I in honor of Divus Maximian (died 310 AD).
Billon half follis
Siscia mint 317-318 AD
o. DIVO MAXIMIANO SEN FORT IMP
laur. And veiled hd. Of Maximian r.
r. REQVIES OPTIMO-RVM MERITORVM (seems to be missing the last M)
Maximian seated l. on curule chair, his r. hand raised and holding short scepter in l.
ex: SIS
ref: RIC vii p429 #41; Sear #16412

see: https://www.vcoins.com/en/stores/victors_imperial_coins/208/product/divo_maximianus_reqvies_optimorvm_meritorvm_from_siscia/596413/Default.aspx