The Roman emperor Domitian personally reorganized Moesia in 87 into two provinces, divided by the river Cebrus (Ciabrus): to the west Moesia Superior - Upper Moesia, (meaning up river) and to the east Moesia Inferior - Lower Moesia (also called Ripa Thracia), (from the Danube river's mouth and then upstream).

Each is governed by an imperial consular legate and a procurator.

From the late third century, Moesi Inferior is known as Moesis Secunda; Mo4esia Superior is known as Moesia Prima.