Mosaic floors (opus tessellatum) paved the floors of the dwellings of the nobility. They were made of small stone squares (tessela) of varied sizes and colours, that when conveniently combined would create more or less successful pictorial compositions. On a fine mortar bed, teselas were placed according to a previously established pattern or drawing, in accordancewith the taste of the customer. Sometimes, the central part with a figure or emblem was built separately, being inserted at a later stage into the rest of the mosaic. The motives or scenes that shape the central emblem are made with smaller teselas, of a few millimetres. This technique is called opus vermiculatum.

In Lugo we can observe some of the most extraordinary examples of Roman mosaics in Galicia.The mosaic found in Calle Armanyá, represents the well-known myth of Daedalus and Pasefae, and stands out for being one of the most complete. Another unique example in Lugo is the mosaic found in Calle Doctor Castro, part of which can be admired in situ, and relates to the famous mosaic of Batitales found in 1842.