A villa is a type of house that was originally an ancient Roman upper class country house. Since its origins in the Roman villa, the idea and function of a villa have evolved considerably. After the fall of the Roman Republic, villas became small farming compounds, which were increasingly fortified in Late Antiquity, sometimes transferred to the Church for reuse as a monastery. Then they gradually re-evolved through the Middle Ages into elegant upper-class country homes. In the early modern period, any comfortable detached house with a garden near a city or town was likely to be described as a villa; most survivals have now been engulfed by suburbia. In modern parlance, "villa" can refer to various types and sizes of residences, ranging from the suburban semi-detached double villa to, in some countries, especially around the Mediterranean, residences of above average size in the countryside.
In terms of design, there was often little difference in the main residence between these types at any particular level of size, but the presence or absence of farm outbuildings reflected the size and function of the estate.
Not included as villae were the domus, city houses for the élite and privileged classes, and the insulae, blocks of apartment buildings for the rest of the population. In Satyricon (1st century CE), Petronius described the wide range of Roman dwellings. Another type of villae is the "villa maritima", a seaside villa, located on the coast.
A concentration of Imperial villas existed on the Gulf of Naples, on the Isle of Capri, at Monte Circeo and at Antium. Examples include the Villa of the Papyri in Herculaneum; and the Villa of the Mysteries and Villa of the Vettii in Pompeii.
There was an important villa maritima in Barcola near Trieste. This villa was located directly on the coast and was divided into terraces in a representation area in which luxury and power was displayed, a separate living area, a garden, some facilities open to the sea and a thermal bath. Not far from this noble place, which was already popular with the Romans because of its favorable microclimate, one of the most important Villa Maritima of its time, the Miramare Castle, was built in the 19th century.[1]
Wealthy Romans also escaped the summer heat in the hills round Rome, especially around Tibur (Tivoli and Frascati), such as at Hadrian's Villa. Cicero allegedly possessed no fewer than seven villas, the oldest of which was near Arpinum, which he inherited. Pliny the Younger had three or four, of which the example near Laurentium is the best known from his descriptions.