Domus is the Latin term meaning house or home. In ancient Rome, these structures were occupied by the wealthy and middle class freedmen during the Republican and Imperial eras.
Along with a domus in the city, many of the richest families of ancient Rome also owned a separate country house known as a villa.
The domus included multiple rooms, indoor courtyards, gardens and beautifully painted walls that were elaborately laid out. The vestibulum (entrance hall) led into a large central hall: the atrium, which was the focal point of the domus and contained an altar to the household gods. Leading off the Atrium were cubicula (bedrooms), a dining room triclinium where guests could recline on couches and eat dinner whilst reclining, a tablinum (living room or study) and tabernae (shops on the outside, facing the street).
Surrounding the atrium were arranged the master's families' main rooms: the small cubicula or bedrooms, the tablinum or study, and the triclinium or dining-room.
In this model was detailed Atrium, Impluvium, Tablinum and Peristilium.
Atrium (plural atria) The atrium was the most important part of the house, where guests and dependents (clientes) were greeted. The atrium was open in the centre, surrounded at least in part by high-ceilinged porticoes that often contained only sparse furnishings to give the effect of a large space. In the centre was a square roof opening called the compluvium in which rainwater could come, draining inwards from the slanted tiled roof. Directly below the compluvium was the impluvium.
Impluvium An impluvium was basically a drain pool, a shallow rectangular sunken portion of the Atrium to gather rainwater, which drained into an underground cistern. The impluvium was often lined with marble, and around which usually was a floor of small mosaic.
Tablinum Between the atrium and the peristyle, the tablinum would be constituted. Sort of office for the dominus, who would receive his clients for the morning salutatio. The dominus was able to command the house visually from this vantage point as the head of the social authority of the paterfamilias.
peristyle is a columned porch or open colonnade in a building surrounding a court that may contain an internal garden.