Regal era , now in the Piazza del Popolo, was once part of the dividing barrier (spina'') at the Circus Maximus The Circus Maximus was sited on the level ground of the Valley of Murcia
(Vallis Murcia), between Rome's
Aventine and
Palatine Hills. In Rome's early days, the valley would have been rich agricultural land, prone to flooding from the river
Tiber and the stream which divided the valley lengthwise. The stream was probably bridged at an early date, at the two points where the track had to cross it, and the earliest races would have been held within an agricultural landscape, "with nothing more than turning posts, banks where spectators could sit, and some shrines and sacred spots". In
Livy's
History of Rome, the first
Etruscan king of Rome,
Lucius Tarquinius Priscus, built raised, wooden perimeter seating at the Circus for Rome's highest echelons (the
equites and
patricians), probably midway along the Palatine straight, with an awning against the sun and rain. His grandson,
Tarquinius Superbus, added the first seating for citizen-commoners (
plebs, or plebeians), either adjacent or on the opposite, Aventine side of the track. Otherwise, the Circus was probably still little more than a trackway through surrounding farmland. By this time, it may have been drained but the wooden stands and seats would have frequently rotted and been rebuilt. The turning posts (
metae), each made of three conical stone pillars, may have been the earliest permanent Circus structures; an open drainage canal between the posts would have served as a dividing barrier.
Republican era The games' sponsor (Latin
editor) usually sat beside the images of attending gods, on a conspicuous, elevated stand (
pulvinar) but seats at the track's perimeter offered the best, most dramatic close-ups. In 494 BC (very early in the
Republican era) the
dictator Manius Valerius Maximus and his descendants were granted rights to a
curule chair at the southeastern turn, an excellent viewpoint for the thrills and spills of chariot racing. In the 190s BC, stone track-side seating was built, exclusively for senators. Permanent wooden starting stalls were built in 329 BC. They were gated, brightly painted, and staggered to equalise the distances from each start place to the central barrier. In theory, they might have accommodated up to 25 four-horse chariots (
Quadrigas) abreast but when team-racing was introduced, they were widened, and their number reduced. By the late Republican or early Imperial era, there were twelve stalls. Their divisions were fronted by
herms that served as stops for spring-loaded gates, so that twelve light-weight,
four-horse or
two-horse chariots could be simultaneously released onto the track. The stalls were allocated by lottery, and the various racing teams were identified by their colors, with the main two being
the Blues and the Greens. Typically, there were seven laps per race. From at least 174 BC, they were counted off using large sculpted eggs. In 33 BC, an additional system of large bronze dolphin-shaped lap counters was added, positioned well above the central dividing barrier
(euripus) for maximum visibility. depicting
Caracalla, and the Circus Maximus, with Augustus' obelisk midway along the central dividing barrier
(euripus or
spina)
Julius Caesar's development of the Circus, commencing around 50 BC, extended the seating tiers to run almost the entire circuit of the track, barring the starting gates and a processional entrance at the semi-circular end. The track measured approximately in length and in breadth. A canal between the track perimeter and its seating protected spectators and help drain the track. The inner third of the seating formed a trackside
cavea. Its front sections along the central straight were reserved for senators, and those immediately behind for
equites. The outer tiers, two thirds of the total, were meant for Roman plebs and non-citizens. They were timber-built, with wooden-framed service buildings, shops and entrance-ways beneath. The total number of seats is uncertain, but was probably in the order of 150,000;
Pliny the Elder's estimate of 250,000 seating places is unlikely. The wooden bleachers were damaged in a fire of 31 BC, either during or after construction.
Imperial era The fire damage of 31 was probably repaired by Augustus (Caesar's successor and Rome's first emperor). He modestly claimed credit only for an obelisk and
pulvinar at the site but both were major projects. Ever since its quarrying, long before Rome existed, the obelisk had been sacred to Egyptian Sun-gods. Augustus had it brought from
Heliopolis at enormous expense, and erected midway along the dividing barrier of the Circus. It was Rome's first obelisk, an exotically sacred object and a permanent reminder of Augustus' victory over his Roman foes and their Egyptian allies in the recent civil wars. Thanks to him, Rome had secured both a lasting peace and a new Egyptian Province. The
pulvinar was built on monumental scale, a shrine or temple (
aedes) raised high above the trackside seats. Sometimes, while games were in progress, Augustus watched from there, alongside the gods. Occasionally, his family would join him there. This is the Circus described by
Dionysius of Halicarnassus as "one of the most beautiful and admirable structures in Rome", with "entrances and ascents for the spectators at every shop, so that the countless thousands of people may enter and depart without inconvenience." , 1911. The staggered starting gates are to the left. The site remained prone to flooding, probably through the starting gates, until
Claudius made improvements there; they probably included an extramural anti-flooding embankment. Fires in the crowded, wooden perimeter workshops and bleachers were a far greater danger. A fire of 36 AD seems to have started in a basket-maker's workshop under the stands, on the Aventine side; the emperor
Tiberius compensated various small businesses there for their losses. In
AD 64, during
Nero's reign, fire broke out at the semi-circular end of the Circus, swept through the stands and shops, and destroyed much of the city. Games and festivals continued at the Circus, which was rebuilt over several years to the same footprint and design. By the late 1st century AD, the central dividing barrier comprised a series of water basins, or else a single watercourse open in some places and bridged over in others. It offered opportunities for artistic embellishment and decorative swagger, and included the temples and statues of various deities, fountains, and refuges for those assistants involved in more dangerous circus activities, such as beast-hunts and the recovery of casualties during races. In AD 81 the Senate built a triple arch honoring
Titus at the semi-circular end of the Circus, to replace or augment a former processional entrance. The emperor
Domitian built a new, multi-storey palace on the Palatine, connected somehow to the Circus; he likely watched the games in autocratic style, from high above and barely visible to those below. Repairs to fire damage during his reign may already have been under way before his assassination. The risk of further fire-damage, coupled with Domitian's fate, may have prompted
Trajan's decision to rebuild the Circus entirely in stone, and provide a new pulvinar in the stands where Rome's emperor could be seen and honoured as part of the Roman community, alongside their gods. Under Trajan, the Circus Maximus found its definitive form, which was unchanged thereafter save for some monumental additions by later emperors, an extensive, planned rebuilding of the starting gate area under
Caracalla, and repairs and renewals to existing fabric. Of these, Pliny claims that Trajan's works gained a further 5,000 seats. Some repairs were unforeseen and extensive, such as those carried out in
Diocletian's reign, after the collapse of a seating section killed some 13,000 people. == Religious significance ==