AGASSA or AGASSAE, a town in Pieria in Macedonia, near the river Mitys. Livy, in relating the campaign of B.C. 169 against Perseus, says that the Roman consul made three days' march beyond Dium, the first of which terminated at the river Mitys, the second at Agassa, and the third at the river Ascordus. The last appears to be the same as the Acerdos, which occurs in the Tabular Itinerary, though not marked as a river. Leake supposes that the Mitys was the river of Katerina, and that Acerdos was a tributary of the Haliacmon. (Liv. 44.7, 45.27; Leake, Northern Greece, vol. 3. p. 423, seq.)