First one is Obv CONSTANTINVS IVN NOB C Rev PROVIDEN-TIAE CAESS with Camp Gate, two turrets, Star above with no gates in the entrance. Mint mark of єSIS Double U makes it SISCIA mint dated AD 328-329 and RIC Vol VII 216
Second one is of the Constantine Family 2 Soldier 2 Standard type. I believe it may be CONSTANTIUS II as Obv seems to have a legend similar to FL IVL CONSTANTIVS NOB C. The Obv will be GLORIA EXERCITVS. Coin date AD330-335 and can be found under SEARS(88) 3986.