Extending over the entire area of the former Plateia, the remains of a public building of the 1st century B.C. have been uncovered. It was destroyed by fire in the middle of the 2nd century A.C. This was a very large building: 41 x 40 m. are in evidence to date. A colonnaded area at the east side is likely to have been the seat of the Roman administrator of the Province of Macedonia. Fragments of wall paintings showing galloping horses, from the destruction level of the building, declare its monumentality. Here is one of the rare examples of buildings with wall paintings which can inform us about the art of painting in Macedonia at the transition of Hellenistic to Roman times.