During recent years, preliminary excavations undertaken by the Archaeological Superintendency for South Etruria in the territories of Capena, Fiano Romano and Morlupo (Rome) have revealed thirteen limekilns dating to between the imperial and medieval periods. The excavations documented their characteristics and fundamental differences, on the basis of which the kilns can be attributed to two preliminary chronological and cultural horizons. It was seen that the linings of the limekiln’s walls were of two different types: a clay impasto about 10-15 cm thick or a facing formed by fragments of stone or reused tile. The latter was characteristic of the limekilns found inside or in the immediate vicinity of ruined Roman buildings and seems to distinguish the limekilns of early medieval date.