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The vestiges of an ancient building, known under the name of „Lentiarion” were discovered towards the south of the cliff, near the “terminus” bus stop, and they were partially studied, in 1964. By the nature of the construction material and the architectural style, they proved to have been used as the public baths edifice, which was closely connected with the mosaic complex, whose southern prolongation they represent.They formed, together with the mosaic, the development centre of the city rich economical and social life in the 4-6th centuries AD.

The edifice included many halls and rooms (vestibule),unfortunately destroyed mostly by the modern urbanistic works. Anyway, the main building hall was preserved,as well as a vestibulum, provided with stairs connecting the edifice and the city terrace. The main hall, 30 m in length and 10 m in width, was paved with large marble slabs (0.60x0,40x0.04m).

The eastern longitudinal wall, built behind the cliff, is rather well preserved (the maximum height is 5.40 m). It consists,in fact, of two walls built in alternative lines of brick and small marble blocks – situated at 0.50 m distance one to another-within there were made a lot of apertures, which permitted a permanent air circulation.In both cases, there were used current solutions for the Roman technique, which intended to protect the buildings against dampness and assured an equal heat in the edifices, mostly during cold seasons, by the circulation of warm air produced by the heating installations (hypocaust).

From the thermae main room, through one of the southen entrances, one penetrated in a large vestibulum (about 60 m²) paved with stone slabs, where from a sauna with large steps it raised at the city level. Under the stairs,there was an annex room built of bricks and with a valuted roof.

In the area outside the edifice, along the whole western wall length (destroyed up to the pavement level a century ago),there have been found arranged the ceramic pipes of the underground heating system (hypocaust). The heated air and the smoke produced by this installation heated equally the room walls (ceramic pipes through which the heated air used to circulate were found embedded in the southern wall, on height), and, inside the walls there were found some sewers with the same destination.

A particular element in the knowledge of this complex functionality is given by the discovery of an inscription on the architrave of the eastern entrance embedding.The decipher of the inscription, preserved in Greek, lead to the conclusion that the present edifice hosted one of the city public baths, and there was mentioned that some of the annexes had been raised on the personal expense of a citizen named  HERMIPPOS, ATTA’s son. 

But the imposing thermal building from Tomis is still less known, as numerosus rooms and compartments specific to the baths are hidden under the city cliff soil. Anyway, the sizes of the discovered rooms allow an imaginary restoration of the monumental architectural proportions of the building, raised most probably in the same period as the Roman Edifice with Mosaic.