First coin is Greek, probably Macedonian - it would help if the obverse was identifiable, but alas.
Second is Constantine II, FL IVL CONSTANTINVS NOB C, might be Heraclea mint RIC VII 32
Third is probably an antoninianus due to the radiate crown, likely during the 3rd century crisis where antoniniani were produced in vast numbers using heavily debased billon silver, probably explains the color of the coin.
Fourth might be Philip the Arab, IMP M IVL PHILIPPVS AVG (IVL and PHILIPPV are visible on your coin), on the reverse is Roma seated left with victory and either spear or scepter. Philip I has a lot of coins bearing the same reverse image, so determining exactly which one it is is kinda difficult without visible text.
5th might be Roman Egypt. Your bottom rightmost picture looks like it has Greek script on it, commonly used on provincial coins.
