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320 in Asia Minor, of which remote province Pliny was governor. Pliny speaks of the new creed as a "contagious superstition, that had seized not cities only, but the lesser towns also, and the open country." Yet he could find no fault in the converts to the new doctrines. Notwithstanding this, however, because the Christians steadily refused to sacrifice to the Roman gods, he ordered many to be put to death for their "inflexible obstinacy."

Trajan died A.D. 117, after a reign of nineteen years, one of the most prosperous and fortunate that had yet befallen the lot of the Roman people.

Reign of Hadrian (A.D. 117–138).—Hadrian, a kinsman of Trajan, succeeded him in the imperial office. He possessed great ability, and displayed admirable moderation and prudence in the administration of the government. He gave up the territory conquered by Trajan in the East, and made the Euphrates once more the boundary of the empire in that quarter. He also broke down the bridge that Trajan had built over the Danube, and made that stream the real frontier line, notwithstanding the Roman garrisons were still maintained in Dacia. Hadrian saw plainly that Rome could not safely extend any more widely the frontiers of the empire. Indeed, so active and threatening were the enemies of the empire in the East, and so daring and numerous had now become its barbarian assailants of the North, that there was reason for the greatest anxiety lest they should break through even the old and strong lines of the Danube and the Euphrates, and pour their devastating hordes over the provinces.

More than fifteen years of his reign were spent by Hadrian in making tours of inspection through all the different provinces of the empire. He visited Britain, and secured the Roman possessions there against the Picts and Scots by erecting a continuous wall across the island. Next he journeyed through Gaul and Spain, and then visited in different tours all the remaining countries bordering upon the Mediterranean. He ascended the Nile,and, traveller-like, carved his name upon the vocal Memnon.The cities which he visited he decorated with temples, theatres and other monuments.