The Ludus Magnus is the largest of the gladiatorial arenas in Rome. It was built by the emperor Domitian (81-96 AD) in the valley between the Esquiline and the Caelian hills. The still visible ruins of the monument belong to a second building stage attributed to the emperor Trajan (98-117).
The Ludus Magnus was located in this area as it was built for the performances to be held at the Colosseum. To facilitate connections between these two buildings, an underground gallery linked the two buildings. The path, with an entrance 2.17 m wide, began underneath the amphitheatre and reached the Ludus at its southwestern corner.
At the centre of the Ludus Magnus, built on two levels, there was an ellipsoidal arena in which the gladiators practiced. It was circumscribed by the steps of a small cavea, probably reserved for a limited number of spectators. The cavea had a four-sided portico (of about 100m per side) with travertine columns. It led to a number of outside rooms, to be used by the gladiators and as services for the performances. Only a few ruins in Travertine remain of the colonnade which was raised in the place where the columns were probably located originally.
In the northwest corner of the portico, one of the four small, triangular fountains has been restored. It lies in the spaces between the curved wall of the cavea and the colonnade. A cement block remained between two brick walls, converging at an acute angle.
The entrances to the Ludus Magnus were built on the main axes. The one at via Labicana, at the center of the building's northern side, was probably reserved for important people, since a decorated place of honour was found on the cavea.
Ludus Magnus gradually fell out of use, along with the Flavian amphitheatre, when gladiatorial combat was outlawed in the 5th century. The building was abandoned in the sixth century when it housed a small cemetery. By the middle of the sixth century, the area was no longer cared for and numerous churches were built, as the population continued to decrease.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.