After the time of Constantine, the administration of Sardinia was separated from that of Corsica, each island being governed by a praeses dependent on the vicarius urbis Romae.
The Palazzo Dario with its dedication, Urbis genio, the superb Manzoni-Montecuculi-Polignac, with its friezes of spread-eagles in low relief, and the Vendramini-Calergi or Non nobis palace, whose facade is characterized by its roundheaded windows of grouped twin lights between columns, are among the more important; though beautiful specimens, such as the Palazzo Trevisan on the Rio della Paglia, and the Palazzo Corner Reali at the Fava, are to be found all over the city.
Several works were written on the capture of Acre in 1291, especially the Excidium urbis Acconensis, a treatise which emerges to throw light, after many years of darkness, on the last hours of the kingdom.
One still earlier, but less complete, appears in the Notitia Urbis Romae, under the title Index Coemeteriorum.
In his work De aquaeductibus urbis Romae commentarius, he considers the methods which were at that time employed for ascertaining the quantity of water discharged from ajutages, and the mode of distributing the waters of an aqueduct or a fountain.
His chief work is De aquis urbis Romae, in two books, containing a history and description of the water-supply of Rome, including the laws relating to its use and maintenance, and other matters of importance in the history of architecture.
As Janus is in the household the numen of the door, so in the state he is the god associated with the great gate near the corner of the forum: the Penates have their analogy in the Di Penates populi Romani Quiritium by whom the magistrates take their oath on entering office, the Lar familiaris in the Lares Praestites of the community, and the Genius in the new notion of the Genius populi Romani or Genius urbis Romae.
The city praefect (praefectus urbis) acted at Rome as the deputy of the chief magistrate or magistrates during his or their absence from the city.
There is an excellent monograph on the Praefectura urbis by P. E.
" Pectuscum :" Pectuscum Palati dicta est ea regio urbis, quam Romulus obversam posuit, ea parte, in qua plurimum erat agri Romani ad mare versus et qua mollissime adibatur Urbo, cum Etruscorum agrum a Romano Tiberis discluderet, ceterae vicinae civitates colles aliquos haberent oppositos.
The oldest is the Notitia ecclesiarum urbis Romae, which was probably compiled under Honorius I.
His orations and letters were published in 1492; but his title to any measure of fame he possesses rests upon his history of Venice, De origine urbis Venetiarum rebusque ab ipsa gestis historia (1492), which was translated into Italian by Domenichi in 1545, and which at the time of its appearance was undoubtedly the best work upon the subject of which it treated.
Boutrays, Urbis gentisque Carnutum historia (1624); A.