sentences:  Later from the 2nd century AD Olbia belonged to the Roman Empire.Scythia was the first state north of the Black Sea to collapse with the invasion of the Goths in the 2nd century AD (see Oium).At the end of the 2nd century AD, King Sauromates II critically defeated the Scythians and included the Crimea into his Kingdom of the Cimmerian Bosporus, a Roman client state.