_The Golden_ Tetrapylum.] _Gyllius_ quotes an unknown Author who will have this _Tetrapylum_ to have been a Quadrangle with _Portico’s_ round it, having Four Gates, and was formerly call’d _Quadrivium_. The _Latines_ call it a _Stadium_. But there’s no such Place to be found in the _Wards_ of the City, unless it be the _Stadium_ in the Fourth _Ward_, which is omitted in the _Summary View_ of the City. _Cedrinus_, in his Life of _Leo Magnus_, mentions this _Tetrapylum_. _Evagrius_ in the _twenty eighth Chapter_ of his _third Book_ tells us, that it was built by the Senator _Mammianus_, in the Reign of _Zeno_. He built, says he, two stately _Portico’s_ of exquisite Workmanship, and beautify’d them with a neat glossy Marble. As to the _Tetrapylum_ built by _Mammianus_, there are not, as _Gyllius_ tells us, the least Remains of it. _Victor_ writes, that there was a _Pentapylum_ in the tenth _Ward_ of _Rome_. _The_ Augusteum.] This was the _Forum_ of _Augustus_. _The Capitol._] At _Rome_, as _Victor_ writes, there were two; the old and the new _Capitol_. _The Mint, or Treasury._] There was no such Place at _Rome_. _Three_ Gradus _by the Sea-Shore_.] There were no such _Stairs_ at _Rome_, yet they had their _Lakes_, their _Naval Fights_, &c. The City is reported to have had twenty three Gates. _Laonicus Chalcondylus_, in his History of the _Ottomans_, tells us, that _Constantinople_ contains in compass a hundred and eleven Furlongs, which is more than thirteen _Italian_ Miles. ’Tis generally thought to be eighteen Miles in Circumference. Besides the foremention’d Curiosities, _Constantinople_ has been famous for the _Aqueduct_ of _Hadrian_, which furnish’d the Palace, the _Nymphea_, and the _Bagnio’s_ with a Sufficiency of Waters, as _Theodosius_ mentions in a Letter to _Cyrus_, _Prefect_ of the City. The _Bagnio’s_ of _Achilles_ are also mention’d by him, where he says, that these _Bagnio’s_ were supply’d with Water convey’d into them from the said _Aqueduct_ by leaden Pipes. _Cedrinus_ says, that these _Bagnio’s_ were built near the _Strategium_, and took their Name from an Altar, which was dedicated to _Ajax_ and _Achilles:_ And _Cassiodorus_ relates, that the Fire, which happen’d in the Reign of _Constantine_ the _Great_, burnt down the City, as far as the _Bagnio’s_ of _Achilles_. _Some Account of the_ Suburbs _as they are mention’d in the_ Codes _and_ Law-Books.