To get things started, the last one is probably an AE from Syria, with Dionysos obverse and thyrsos reverse. Reverse legend may be AΠAMEΩN THΣ IEPAΣ KAI AΣYΛOY.
The middle coin is one of Constantine's sons, as Casear - the last four letters of the obverse legend are NOBC. The reverse is 2 soldiers, 1 standard, GLORIA EXERCITVS type. Mint is SMK Gamma, Cyzicus.
The middle coin, which is clearly one of the Caesars, could also possibly be Delmatius, the nephew of Constantine. I believe it is Constans though, as I seem to be able to read FL IVL CONSTANS NOB C
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