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The Capitoline hill, which Virgil means by "arx" a conspicuous object from the river just below the
Social life at Rome in the Age of Cicero W. Warde Fowler 1884
Howsoever, pure water is best, and which (as Pindarus holds) is better than gold; an especial ornament it is, and very commodious to a city (according to  Vegetius) when fresh springs are included within the walls, as at Corinth, in the midst of the town almost, there was arx altissima scatens fontibus, a goodly mount full of fresh water springs: if nature afford them not they must be had by art.
And the face especially gives a lustre to the rest: the face is it that commonly denominates a fair or foul: arx formae facies, the face is beauty's tower; and though the other parts be deformed, yet a good face carries it (facies non uxor amatur) that alone is most part respected, principally valued, deliciis suis ferox, and of itself able to captivate.
In this sense we are all fools, and the  Scripture alone is arx Minervae, we and our writings are shallow and imperfect.
Buchanan, as an arx inexpugnabilis, and, indeed, it must have been impregnable by the antient manner of besieging.
The Jebel el-Safrá shows the foundations of what may have been the arx.
The Land of Midian 2003
By many this isolated rock is considered the arx or citadel of Veii; but the existence of so many sepulchral caves in it is, as Mr. Dennis says, conclusive of the fact that it was the Necropolis of the ancient city, which must therefore, according to Etruscan and Roman usage regarding the interment of the dead, have been outside the walls.
Roman Mosaics Or, Studies in Rome and Its Neighbourhood Hugh Macmillan
Nec plura elocutus hominem dimittit, qui, non solum injuriae tantae morsu perculsus, sed monitis regis incitatus, quae ille tanquam ignaviae exprobationem si injuriam ferret accipiebat, protinus domum revolat, summo silentio, ut Bussium lateret: astuque per uxorem ad Bussium literas dari curat, quibus ei horam ad secretum Coustanteriae condicebat; ea erat arx voluptuaria et venationibus opportuna; ad quam cum Bussius cum Colladone conscio sub vesperam XIV Kal.
Bussy D'Ambois and The Revenge of Bussy D'Ambois George Chapman
The head is touched as being the source from which the oracle is to proceed (_arx et regia_, chap. 50).
The Apologia and Florida of Apuleius of Madaura Lucius Apuleius 1914
Around the temple there was an enclosing wall with towers at intervals, the arx
The Catholic Encyclopedia, Volume 10: Mass Music-Newman 1840-1916 1913