April: Galerius concedes his presecution of the Christians a failure; Maximinus Daia continues Christian presecution within his territories.

Galerius dies of disease in Nicomedia. Constantine, Maxentius, Licinius and Maximinus Daia remain in power, all as Augusti.

Maxentius (in Rome) vows to avenge his father's death at Constantine's hand; a subservient Roman Senate deifies Maxentius.

later 311 or early 312: Constantine betroths his half-sister Constantia to Lincinius Augustus, which threatens Maxentius even further.

Upper part of the arch of Janus at Rome, in which the same kind of masonry exists, but less regularly executed.

The Arch of Janus Quadrifrons, Rome (c. A.D. 315), in the Forum Boarium, is another example of a four-way arch, but is of poor design. It has a simple cross-vault with embedded brick box-ribs at the groins, affording a further instance of the progressive character of Roman construction techniques: such ribs are possibly the prototypes of Gothic ribbed vaults.
Sir Banister Fletcher

Fletcher is being a little two faced himself here--first the Arch of Janus is not good design, and then the arch is progressive construction!

Arco di Giano
Via del Velabro
early 4C AD
Today this building is identified as the Arcus Constantini, which Constantine's regional catalogues mention for Regio IX. It is a tetrapylon with four arched, and two passages which intersect in the form of a cross. This type of structure was known since the time of Augustus (Cavaillon), but equal importance was not given to all four sides until the Arch of Galerius was built in Thessaloniki in the period of the tetarchs. It was in that period that Constantine then assumed the dictatorship. Like the earlier examples, Janus Quadrifrons was probably topped by a superstructure, but this was removed in 1830 along with the medieval tower which the Frangipane family had placed on top.
Janus is the Roman disignation for this structural type, and is at the same time the name of the god of routes and beginnings. His shrine in the Forum Romanum consists of two passages which were opened in wartime and closed in peacetime. Constantine chose the point where two old routes intersected as the site for this structure. One of them ran from the veneable Forum Boarium to the Velabrum depression and thus to the political Forum Romanum. The Cloaca Maxima also followed this route. The second route, proceeding from north to south, was the trade route to which Rome owes its origin.
There are two characteristic design principles, both of them in the Roman late-classical spirit: the building is subdivided by niches with shell-shaped vaults and, between the niches, by small columns (now lost) supported on corbels. These elements are placed so regularly and so close together that the impression of a glittering carpet is aroused, very much at variance with the weighty, cube-shaped mass of the building. A feature of similarily atectonis, late-classical design is the horizontal strips which line Janus Quadrifrons on all sides, even inthe passages, thus degrading him to a mere bearer of linear decoration.
Stefan Grundmann, The Architecture of Rome (Stuttgart: Editions Axel Menges, 1998), p. 64.

Arch of Janus
The Arch of Janus is situated in the Velabrum
The Arch was built around 356 AD by Constans II in hounour of Constantine. The formal name was "Arcus Divi Constantini", Arch of the Devine Constatines. At that time Rome was no longer the capital of the empire, and the occation was a rare visit by Constans II to Rome. Janus was the divinity of arches, gates, doorways and bridges, but the present name is a later invention.
The arch is build on a square basis, 12m wide, and it is 16m high. The structure is marble clad, in part with reused marble from other monuments. All the sides are decorated with two rows of semicircular niches, that used to contain statues. Now all decoration is lost, only the shell formed upper parts of the niches remain. The niches were originally flanked by two small columns each as was the taste of the 4th century. The remains of the original roof was demolished by mistake in 1837, because it was belived to medieval.
The arch was transformed into a fortress in the Middel Ages by the Frangipane family, who built a tower on top of it. When this tower was removed in the 19th century, some ancient structures went with it.
René Seindal, "Arch of Janus" (www: 2000.09.26).

IANUS QUADRIFRONS: the name ordinarily given to a four-way arch of marble, which stands directly over the cloaca Maxima, and probably marked the line of separation between the forum Boarium and the Velabrum. It consists of four piers connected by quadripartite vaulting, and is 12 metres square and 16 high. The arches themselves are 10.60 metres high and 5.70 wide. Round all four sides run two rows of niches for statues, forty-eight in all, of which sixteen are unifnished. The keystones of the arches were sculptured, and the figures of Minerva and Roma are still visible on the north and east sides. The structure is of late date, third or fourth century, and may perhaps be identified with the arcus divi Constantini in Region XI.

Hülsen points out that the superstructure, which was removed in 1827 as mediaeval, probably belonged to the attic; and reconstructs it with a pyramid on top.
Samuel Ball Platner, A Topography and Monuments of Ancient Rome (Boston: Allyn and Bacon, 1904), p. 280.

Likewise, on the Forum Boarium a huge tetrapylon, misnamed the Janus Quadrifrons, seems to have been built by Constantine.
Richard Krautheimer, Three Christian Capitals: Topography and Politics (Berkeley: University if California Press, 1983), p. 26.

'Arch of Janus'
Via del Velabro
A massive marble structure 16m. high, 12m. wide, the four-way arch stands with its piers astride the Great drain (Cloaca Maxima) which runs down the valley to the Tiber beside the Round Temple. Possibly an 'Arch of the Deified Constantine' which is listed in this area in the Regionary Catalogues, it must date from the early C4 AD (the quadripartite concrete vault over the crossing incorporates terracotta storage jars in a technique typical of the period) and probably replaced an earlier one on the same spot. It seems not to have been a triumphal arch but a Janus of the boundary marker type found in the Roman Forum (which may also have coincided with the Drain. Much of the marble shows signs of having been reused, but the rather rough appearance and squat proportions are misleading. The holes at every joint were made in the Middle Ages to extract the iron dowels which held the blocks together and all four facades have also been robbed of the small freestanding colonnades which projected in front of the niches on both levels. Whether the niches were intended to contain statues is uncertain but their semidomes are elegantly carved in the form of scallop shells. A figure of Minerva is carved on the keystone of the archway on the north side; Roma appears on the east. A doorway in the SE pier led up to a suite of chambers and corridors in the upper reaches; the arch must have had an attic storey, which some would restore as a pyramid but is more likely to have been rectangular, echoing the podium-like footings. A substantial superstructure in brick-faced concrete was removed in 1830 in the belief, perhaps mistaken, that it was the remnant of C13 fortifications by the Frangipane family.
Amanda Claridge, Rome: An Oxford Archeological Guide (Oxford: Oxford University Press, 1998), p. 258.




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