_Evagrius_) tells us, that in the Reign of _Zeno_ the Emperor, one _Mamianus_, an eminent Senator, built at _Constantinople_ some handsome _Portico’s_, and that between two of them he built a _Tetrapylum_, as a Boundary to both, which he splendidly adorned with Brass and Marble Pillars; and adds, that in his Time the _Portico’s_ bore the Name of some Emperor, and that large Stones of _Proconnesian_ Marble, the Reliques of their antient Beauty and Magnificence, lay on the Ground, but that there was not the least Sign of the _Tetrapylum_ remaining. The _unknown_ Author abovementioned says, that in this _Tetrapylum_, over the Pillars, there was a Chamber, where the Empress, and the Relations of the Emperor deceased, received the News of his Death; and having their Faces veiled, bewailed his Departure till six o’ Clock in the Evening, when meeting the Corpse passing by, they attended it to the Church of the _Apostles_, where they usually buried their Emperors. The _Tetrapylum_ seems to me to have formerly been the Temple of _Janus Quadrifrons_, and stood near the _Capitol_. It had, like that of _Old Rome_, four Doors, denoting the four Seasons of the Year. For _Janus_ takes his Name _ab eundo_, and therefore all _Passages_ are said to be sacred to him, and the Doors of all Temples are called _Januæ_. Some Authors tell us, that in the _Forum Pistorium_ there was a quadrilateral _Pyramid_. _Cedrinus_ defines this _Tetrasceles_ to be a quadrilateral Engine, invented to shew in what Point of the Compass the Wind stood, and adds, that _Theodosius the Great_ erected a Machine in the Form of a _Pyramid_, adorned with several Figures of Animals, of Plants, of Fruits, of gilded Bunches of Pomegranates, and naked _Cupids_, in _Basso Relievo_. Some of these _Cupids_ were cut in a gay smiling Humour, some of the Uppermost were wantoning, and playing their little Tricks with those who were below them, while others were dancing. There was carved upon it a Set of young Fellows playing upon brazen Pipes. On the Top of the _Pyramid_ was a Vane, or Weathercock, which shewed in what Corner the Wind sat. The Statues of _Arcadius_ and _Honorius_ were placed near the Statue of _Theodosius_ their Father; that of _Arcadius_ in an Eastern, and that of _Honorius_ in a Western Nich. _Socrates_, who has wrote the _History of the Christians_, tells us, that _Valens_ the Emperor built out of the Ruines of _Chalcedon_, a large _Aqueduct_, which he brought into the City, and which supplied a very capacious Cistern, built by _Clearchus_, who was _Prefect_ of _Constantinople_, and which, in his Time, was called the _Cistern_, or, as the original Word in _Socrates_ seems more properly to signifie, the _Lake_ of _Theodosius_. _Zonaras_ and _Cedrinus_ call this Lake a _Nympheum_, and add to the Authority of _Socrates_, that the _Prefect_ of the City celebrated there a great Festival, and very splendidly entertained all the People. I would remark from these Citations,