Sextus Julius, a Roman soldier and the author of some interesting works, was born of a patrician family at Rome, in the first century after Christ. Nothing is known of his early life or history till we find him acting as praetor urbanus under Vespasian, A.D. 70, an office from which he soon retired to make way for Domitian. Five years later he was sent into Britain to succeed Cerealis as governor of that island. He subdued the Silures, and held the other native tribes in check till 78, when he was superseded by Agricola. In 97 Frontinus was appointed curator aquarum at Rome, an office which was never conferred except upon persons of very high standing. He was also a member of the College of Augurs, a dignity he retained till his death, which appears to have happened about A.D. 106. Many works have been attributed to Frontinus, of which only two that are undoubtedly his are now extant. The first of these is a treatise on the art entitled "Strategematicon, libri iv," which is a miscellaneous collection of the sayings and doings of the most famous soldiers of antiquity, recorded in the form of anecdote. The second is entitled "De Aqueductibus Urbis Romae, libri ii." It conveys in plain and modest language much valuable information on the manner in which ancient Rome was supplied with water, and other matter of importance in the history of architecture. A number of other treatises have been ascribed on indirect testimony to Frontinus. The two works above mentioned have been translated into all the languages of Europe. The best editions of the "Strategematica" are those of Oudendorp, Leyden, 1731; and Schwebel, Leipzig, 1772. The best edition of the "De Aqueductibus" is that of Polenus, Pavia, 1722.