The excavations of the year 2006 in the theatre were located on the outer side of the cavea, near by its foundation level. The excavations intended to verify the building characteristics and define the construction phases of the theatre. A sondage measuring to 3, 7 x 2, 0 m was carried out under the eastern entrance of the seating area. The cleaning revealed the archaeological levels that relate to the structure. The excavation demonstrated that the outer wall is set on a clay layer, used probably as a foundation level. While the staircase that provided access, though abutting the wall, relates probably to the earliest construction phases of the theatre. The archaeological material discovered consists of a few finds, mainly pottery fragments painted in black varnish, etc., which date to the 2nd century A.D. During this season was also cleaned the surface area of the cavea.

The excavation of 2009, carried out in the theatre of the ancient city of Hadrianopolis, aimed at understanding the building techniques, construction period and the monument’s phases of use. The material revealed during the excavation (mostly artifacts and architectonic elements), show that the theatre is a construction of the first half of the 2nd Century AD. Therefore, it’s probably that the construction of the monument begun at the end of the reign of Hadrian. The Roman historian Dio Cassius, reports the Emperor’s interest in the constructions of magnificent public buildings, however, not many of the theatres of the Roman world, could be attributed with certainty to Hadrian. The building technique of stone blocks bonded with mortar, the grounding of theatre’s _cavea_ on artificial soil layers, and its structural association with the _scaena_, indicate that the theatre belongs to the Roman building tradition. The plan of the orchestra, the shape of the _cavea_, exceeding the standard semicircular form, as well as the size and the shape of _scaena_ (narrow and slightly disjointed from the _cavea_), are similar to those of the ancient Hellenistic theatres found in the eastern part of the Roman Empire. The presence in the theatre of Hadrianopolis of various architectonic features, originating from Greek and Roman tradition, appears to follow the same examples as in the other theatres of the region. In the subsequent later periods, the theatre underwent major changes, and it is likely that during the Byzantine period, this construction was used as an urban stronghold.

During the archaeological season of 2010 undertaken in the ancient city of Hadrianopolis, at the same time as the restoration of the Roman theatre orchestra’s floor, some smaller trenches were opened beneath its flagstone level. The excavation identified details of the theatre’s building techniques and confirmed its construction date to the reign of Hadrian. The most significant discovery was that of the remains of an earlier structure, revealed below the bottom level of the theatre. From this structure are preserved only the foundations of an arched wall of limestone blocks and reused tiles; the associated artifacts date to the Hellenistic period. However, further investigations will enable us to see whether the structure belongs to a Hellenistic building, functioning probably as the city’s public assembly (_bouleuterion?_), or as a place for theatrical shows (theatre?). During the excavations, remains of the supporting columns of the _porticus post scaenam_ were also discovered. The archaeological data confirms that the theatre remained in use even during the end of the 4th Century AD, this probably due to the rehabilitation of the floor on the western side of the orchestra and the _scaena_, where supporting timber columns were replaced by soil deposits.