If any credit can be given to this marvellous tale, which seems, however, to be countenanced by the manners of the people, and by the extraordinary duration of his reign, we must admire not only the fortune, but the genius, of Sapor.

In the soft, sequestered education of a Persian harem, the royal youth could discover the importance of exercising the vigor of his mind and body; and, by his personal merit, deserved a throne, on which he had been seated, while he was yet unconscious of the duties and temptations of absolute power.
His minority was exposed to the almost inevitable calamities of domestic discord; his capital was surprised and plundered by Thair, a powerful king of Yemen, or Arabia; and the majesty of the royal family was degraded by the captivity of a princess, the sister of the deceased king.

But as soon as Sapor attained the age of manhood, the presumptuous Thair, his nation, and his country, fell beneath the first effort of the young warrior; who used his victory with so judicious a mixture of rigor and clemency, that he obtained from the fears and gratitude of the Arabs the title of Dhoulacnaf, or protector of the nation.
The ambition of the Persian, to whom his enemies ascribe the virtues of a soldier and a statesman, was animated by the desire of revenging the disgrace of his fathers, and of wresting from the hands of the Romans the five provinces beyond the Tigris.

The military fame of Constantine, and the real or apparent strength of his government, suspended the attack; and while the hostile conduct of Sapor provoked the resentment, his artful negotiations amused the patience of the Imperial court.

The death of Constantine was the signal of war, and the actual condition of the Syrian and Armenian frontier seemed to encourage the Persians by the prospect of a rich spoil and an easy conquest.