First of all is a roman emperor Licinius I bronze follis.
Obv: IMP LICINIVS AVG
Rev: I need a better image (sorry!) but probably is a "IOVI CONS" or similar (Juppiter the protector).
The second is more interesting.
Is a half reales (1/2 real) piece minted in Mexico under Philip II of Spain (assyer "O")
It was minted between 1556 and 1598.