380s

The 380s decade ran from January 1, 380, to December 31, 389.

thumb|Tremissis from Constantinople in the second reign of Zeno (emperor)|Zeno upright|thumb|Merovingian dynasty|Frankish gold Tremissis with Christian cross, issued by minter , [[Dorestad, Netherlands, mid-600s]]

4th century treaty between the East Roman and Sassanid Empires