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When Leo the Isaurian attempted, in the eighth century, to repress the worship of images, the resistance which he met at Constantinople, though violent, was speedily allayed; but the Pope, assuming a far higher position than any Byzantine ecclesiastic could attain, boldly excommunicated the emperor, and led a revolt against his authority, which resulted in the virtual independence of Italy.

Leo the Isaurian, Michael Curopalates, Leo the Armenian, and the Regent Empress Theodora in vain sought their extermination in the eighth and ninth centuries, until at length, in the latter half of the tenth century, John Zimiskes tried the experiment of toleration, and transplanted a large number of them to Thrace, where they multiplied greatly, showing equal vigor in industry and in war.

The road now runs along the ridge of the hill to the Porta Salara, by which Alaric entered Rome through the treachery of the Isaurian guard, on the 24th of August, 410.

Gregory II. wrote of it to Leo the Isaurian: "Christ is my witness, that when I enter the temple of the prince of the Apostles, and contemplate his image, I am filled with such emotion, that tears roll down my cheeks like the rain from heaven."

By this gate, known as the Porta Asinaria, from the family of the Asinarii, Belisarius entered Rome in 505, and Totila, through the treachery of the Isaurian Guard, in 546.