Forum complex

The monumental forum complex of the 3rd century included a basilica, a curia, baths and two porticos with numerous shops (tabernae).^[10] It was built over an earlier forum and buildings from the 1st century.

A monumental façade adorned the forum, a high stone wall with large columns imitating the stage fronts of a theatre, covered in marble, topped with sculptures, and in the central opening a poetic inscription, a Carmen Epigraphicum (based on Virgil's Aeneid) that commemorated the renovation of the forum at the end of the 3rd century.^[11] The cryptoporticus was built to raise the floor and provide a more impressive facade and monumental entrance to the curia. To build this it was also necessary to demolish the east wing of the quadriporticus which until then had stood beside the baths. It stands above an aqueduct that supplied the north baths and therefore lost its original function.

The basilica was one of the most important places in the city as courts of justice and office of commercial agreements. It was built in the 3rd century over an earlier basilica and the north baths. The building had a central nave with a surrounding corridor, separated by a row of columns.

The north baths of the 1st century were attached to the early basilica. The caldarium consisted of a large heated room with opus signinum floor over a hypocaust whose heat was produced in a praefurnium of two large ovens located to the south. An apse on the south side included a hot water pool above which windows made the most of the sun. At the end of the 3rd century the baths were transformed into the curia, the meeting place of the senate. The hypocaust heating system was preserved to serve the senate members.

The curia was where the Paredón del Milagro (miracle wall) was situated, an object of Christian worship throughout the centuries, since tradition places the martyrdom of Saints Justus and Pastor on this wall, although it was probably here that the sentence was passed but was executed in the Campo Laudable just outside Complutum.^[12]

The southern baths were built at this time to replace the north baths. They were smaller than the earlier baths but, to maximise their size, the Decumanus IV was built over. Their layout was of a simpler linear provincial type with a succession of four heated environments: first, facing north, the apodyterium (changing room), second the frigidarium with a cold pool, then the tepidarium and finally the caldarium to make the most of the sun. The heated hypocaust with praefurnium remains in place for the last two rooms.

Auguraculum

Located next to the forum, the auguraculum is an unusual public building: the collegium of the augurs (the priests who celebrate the rituals of divination and other purifying offerings), regulating religious lives of citizens and public activity.

The main hall had two offering wells and six small sacrifice reservoirs, each containing a ceramic jug and remains of one or more sacrificial animals (mostly chicken). In another room, another reservoir with a buried child was found and remains of weighing instruments and a statuette of Mercury, messenger of the gods and god of commerce.

House of Griffins

In the centre of the city is the House of the Griffins, built in the middle of the 1st century and in use until the 4th century, when it was destroyed by an accidental fire. It was one of the best domus in the city, with unusual comforts (a fireplace in room F and a water storage and distribution system). It had a large area (900 m²), with a large inner courtyard (99 m²) surrounded by a peristyle with twelve columns (two of them double) leading to a series of rooms. Wall paintings of all kinds have been found in them, among which some well-preserved ones stand out.^[13] Those on the west wall of room E, the tablinum of 48.6 m², the guests and clients reception room, are of the second Pompeian style, in fashion during Hadrian's time (117-138). They represent a simulated architecture of 7.6 × 4.9 m with two Ionic columns on a plinth that imitates marble panels, among which an elaborate yellow plinth supporting a framed flower in its centre stands out.

Other frescos include panels with plants or candelabra, kraters, fountains, clipei, situlas, and cornucopias. In "room D" there is a floating human figure; in the south corridor a horseman in a hunting scene; and in room J a sun god, a triumphant swan (Jupiter metamorphosis), a naturalistic bird and the griffins that give the house its name. In the peristyle, wooden latticework and metal gates are imitated.

House of Hippolytus

Although known as the House of Hippolytus, it was in fact the headquarters of the Youth College and all the rooms were related to leisure.^[14] The largest room has a large mosaic with a fishing scene. The work is signed by Hippolytus, a master mosaicist of possibly North African origin (present-day Tunisia is the most feasible place) and was made for one of the most important families in the city.^[15]

Other buildings

Other buildings stand out for their wealth of mosaics, such as that of the four seasons from the House of Bacchus, House of Cupids and House of Leda. The House of Mars is an atrium house built for a family unit. The atrium was without columns and the impluvium in the centre collected rainwater and around it were situated all the rooms.