House of the Thunderbolt (Domus Fulminata)


Italia (Pleiades)


Ostia (Pleiades)

Location Description

Ostia Antica, the port-city of Rome, was situated at the mouth (ostium) of the Tiber, where it flowed into the Tyrrhenian sea. Rome was situated further upriver, several kilometres from the sea. By its maritime position, Ostia also protected the landing at the mouth of the river; it controlled the trade that ran along it, and also the production of salt in the nearby salt works. Ancient historians believed that the city had been founded in the 7th century by king Ancus Marcius; archaeological evidence shows that the first settlement was founded as a colonia maritima in the 4th century BCE. and that it was already acting as the harbour of Rome in the 3rd century BCE.

From the 2nd century BCE Ostia (and later Portus) was the main port for the landing of wheat and other foodstuffs destined for the markets of Rome. It was a lively and cosmopolitan port city, where the great cargo ships unloaded produce from all over the Mediterranean and beyond. At Ostia the freight was transferred to riverboats to be sent upriver to Rome. This thriving commercial activity was accompanied by demographic and economic growth and by the presence of people coming from all over the known world.

Ostia is especially well known in archaeological and historical studies for its building history. The earliest Ostian houses are only known from sporadic traces, beginning from the 2nd century BCE. They were domus of traditional type, both in the simplest version, of direct Italic derivation, with rooms arranged round the atrium, and in the more complex Roman-Hellenistic form, in which the peristyle with the garden was added (e.g. the House of the Bucrania). They were single-family houses, generally single storied, or with an upper story limited to the height of the atrium.

The transition to a different type of house was marked by the so-called peristyle house, such as the House on the Via del Tempio Rotondo, which dates to the Augustan period, the one found below the Schola of Trajan (built 20-40 CE) and the House of the Thunderbolt, datable to the Vespasianic period (69-79 CE). In this latter type of house the rooms are laid out around a small central colonnaded courtyard, sometimes provided with a garden, more often paved. The later examples of this type include the first phase of the House of Fortuna Annonaria, with its garden (140-190 CE).

Ostia was heavily reconstructed in the 2nd century CE, under the pressure of the growth in population due to the completion of its ports. The new city followed new canons of utilitarian, high-density building, based on the multi-storied insula, which aimed at the efficient use of the little space available. A room with windows on the façade became a kind of atrium-room. The plan became enriched with smaller rooms and internal staircases that ascended to the private apartments of the upper floor. Independent stairways entered from the street provided access to the apartments on the second and upper floors. The most accomplished examples of this type of building date to the Hadrianic period, for example in some insulae that compose the so-called Garden Houses. In another type of insula the main source of light is not the street, but an inner arcaded courtyard.

The internal space was not always delimited by a portico; the Insula of the Paintings, comprising the houses of Jove and Ganymede, of the Infant Bacchus and of the Paintings, arranged according to an L-shaped plan, had its façade facing onto two streets, forming a corner, while its inner sides faced onto a fairly extensive garden, without porticoes.

In the 3rd and 4th centuries, the tenement houses of the less well-to-do fell into ruin or were patched up. Private building seemed limited to the erection of new patrician domus (e.g. the House of Amor and Psyche), built on the ground floor of already existing buildings and richly decorated with costly marbles. In these houses the gardens were chiefly an ornamental backdrop.

The internal garden of the house at Ostia described by St. Augustine (Confessions 9.10.23), which forms the setting for the conversation with his mother St. Monica in CE 388, is precisely of this type: a decorative backdrop that enhanced the peace and quiet of the interior of the house, an antithesis to the frenetic but vain life of the city outside.

Ostia gives us, all things considered, the idea of a heavily built-up city, which sacrificed much of its greenery in the attempt to exploit building land as intensively as possible. This must have been the case especially in the most intensive building phase in its history (1st-3rd century CE). As a consequence, the gardens laid out before this period were in large part destroyed by subsequent building activity. Later garden layouts, on the other hand, were wiped out by the frantic campaign of excavation in the years 1938-1942, conducted in preparation for the World Exhibition, never held due to the outbreak of the Second World War. But today, thanks to the new excavations being conducted at Ostia by Italian and international research groups, using the most modern methods of investigation, the gardens of the ancient city are finally being recovered. In all the cases so far ascertained, they were gardens laid out within peristyles/courtyards, associated with wells or fountains for irrigation. In some cases, the excavators found the classic perforated vases, in others large fragments of terracotta containers. As regards garden furniture, only the Domus of Fortuna Annonaria provided some reliable data.

Ostia in ancient times, however, must have been a good deal greener and richer in vegetation and flora than now seems the case; the ancient sources in fact speak of the flourishing cultivation of vegetables, leaks, melons and salads in Ostian territory. In the 5th century CE “the Isola Sacra is so lush and pleasant that it does not lack admirable grazing land, neither in the summer, nor in the winter months; in the spring, moreover, it is filled with such a profusion of roses and other flowers that it may be called, for its luscious flowering fragrance, the Lebanon of bountiful Venus” (Cosmographia: 25.25-30).

Location Plan

General Plan of Ostia Antica

Ostia Antica, General Plan.


House of the Thunderbolt (Domus Fulminata)
House of the Thunderbolt (Pleiades)


Garden Description

The peristyle garden, excavated in 1941, was surrounded by a portico on all four sides, supported by brick columns, some of which were paired or clustered in threes (Fig. 1). In the original building, dating to the Flavian period, the garden (a) was furnished with a brick biclinium, with the klinai placed opposite each other. Behind the klinai was an aedicula-shaped lararium with a cylindrical marble altar in front of it (Fig. 2). On the opposite side, and aligned with the entrance, was the basin of a fountain with a polychrome mosaic in blue and yellow tesserae (built in a second phase, c. 150-200 CE). It was probably fed by the lead pipe (stamped SEXTILIUS SECUNDUS FECIT) that was seen by the excavators leading from the entrance towards the Decumanus. A well-head (Figs. 3-4), placed at the entrance to the garden, had a purely ornamental function, since its bottom is sealed and it only has a hole for the runoff of water. A cube-shaped stuccoed brick pedestal was erected at the southwest corner of the peristyle. Into its sloping top was inserted a marble plaque, inscribed with the letters FDC (“fulgur dium conditum”). It marked the spot where lightning had struck, as well as things that had been struck by the same lightning bolt and ritually buried to placate the wrath of the gods.

The residential rooms of the domus were placed on its upper floor. Some experts think that the main reception rooms should be identified in the wing facing onto the northwest side of the garden. However, not everyone agrees that the House of the Thunderbolt was a private residential building. It could also have been the site of a college or corporation, which some archaeologists connect with the nearby sanctuary of the Bona Dea. The rooms aligned along the eastern side, all intercommunicating, would have been, in this case, the ceremonial rooms of the college, whereas the residential sector of the building would be identifiable in the rooms on the western side.

The house is one of the most interesting examples of the transition from the atrium peristyle house of Republican tradition to the house with a colonnaded courtyard typical of Ostian residential architecture in the 2nd century CE.


Plan of Domus Fulminata

Figure 1: Plan (after Calza 1953).

Photo of the garden of the Domus Fulminata in 1941

Figure 2: Garden, 1941 (PA-OAnt, Photo Archive).

Basin shaped as a well head in the garden of the Domus Fulminata

Figure 3: Basin shaped as a well-head (PA-OAnt, Photo Archive).

Section of the basin in th

Figure 4: Section of the basin (from Ricciardi, Scrinari 1996).


Flavian period
150-200 CE

Excavation Date



  • G. Calza, G. Becatti, I. Gismondi, G. De Angelis D’Ossat, H. Bloch, Topografia generale, Scavi di Ostia I, Rome, 1953. (worldcat)
  • R. Meiggs, Roman Ostia. (worldcat)
  • C. Pavolini, Ostia: Vita quotidiana. (worldcat)
  • Jean-Paul Descœudres, Ostia: Port et porte de la Rome antique. (worldcat)
  • E.J. Shepherd, P. Olivanti (eds), Giardini ostiensi, Bullettino della Commissione archeologica comunale di Roma, 109, 2008, pp. 69-98. (worldcat)
  • M. De Vico Fallani, C. Pavolini, E. J. Shepherd, M. Pileri, "Le sistemazioni a verde di Michele Busiri Vici per Ostia Antica: un caso di studio," Rivista di Archeologia 43, 2019, pp. 165-176. (worldcat) (Rivista di Archeologia)
  • M. De Vico Fallani, C. Pavolini, E. J. Shepherd, M. Pileri, "Un sogno lasciato a metà: il progetto di Michele Busiri Vici per le sistemazioni arboree e per i giardini nella zona di Ostia Antica Scavi (1939-1941)," Bollettino d’Arte, in press. (worldcat)
  • Giornale degli Scavi, 1941, pp. 56-58, 66.
  • M.A. Ricciardi, V. Santa Maria Scrinari, La Civiltà dell’acqua in Ostia Antica 2, Rome, 1996, pp. 108-111. (worldcat)
  • L.B. van der Meer, N.L.C. Stevens, H. Stoeger, "Domus Fulminata: The House of the Thunderbolt at Ostia (III, vii, 3-5)," Bulletin Antieke Beschaving 80, 2005, pp. 91-111. (worldcat)

Pleiades ID





Paola Olivanti

Publication date

21 Apr 2021