The eleventh archaeological campaign at the site of Coriglia in the municipality of Castel Viscardo, along the valley of the Paglia River in the area of the Parco Archeologico dell’Orvietano, was begun in the month of May 2016.

Stratigraphic studies for the year were limited to sectors A and C. For sector A, investigation of the northwestern area, previously excavated in the 1990s by the Soprintendenza Archeologica per l’Umbria, revealed a coherent paved surface (US 135), 4.6 m long and 5 wide, sloping from S to N, consisting of a mixture of stone flakes and brick fragments, probably the via glareata underneath the previously excavated road. The paved portion is bordered on the W by an embankment of medium-size river stones (US 29) while on the E, work for the water main eliminated all but a short row of stones, indicating the whereabouts of the border. A manhole (US 144) for controlling rainwater was found on the E. Measuring 70×50 cm, it consisted of stones lodged in a yellowish mortar. An almost complete fritillus (dice-box) and fragments of Italic terra sigillata were found inside. The shaft had a cover consisting of a block of tufa (US 146) with two circular indentations for lifting.

The second area investigated was that of sector C. In cleaning a drainage canal covered by lime incrustations from thermal waters, building material came to light, consisting of pieces of painted intonaco and architectural terracotta fragments of the early Imperial Age, including a slab with an ovolo cornice and a figure of Dionysus holding a thyrsus. Particular attention was given to the excavation of a vaulted structure, which had come to light the previous year, in an attempt to discover its continuation eastwards and reveal the entrance. The stairs were buried under discarded building materials (US 667, US 671, US 688), consisting on the whole of broken pieces of cocciopesto within which there were various fragments of Late Antique pottery (3rd-4th cent. CE African cooking ware with rouletted decoration on the exterior bottom of the pan and an oven/cover clibanus from the middle of the 4th cent. CE). A bronze coin of 297 CE coined by Diocletian, a terminus post quem for the collapse of the structure (US 649 – US 682), was found in the fill of the vaulted room (US 654). The underground structure was therefore still intact up to the third century CE, but no longer serving as a cistern for water. The entrance to this structure consists of a steep staircase of 7 steps in tufa, river stones and mortar, each step around 30/35 cm high and with a tread of 30/33 cm.