In his next campaigns Heraclius endeavoured to liberate the rest of the Roman Empire by a similar plan: he resolved to assail Chosroës at home, and [pg 136] force him to recall the armies he kept in Syria and Egypt to defend his own Persian provinces. In 623-4 the Emperor advanced across the Armenian mountains and threw himself into Media, where his army revenged the woes of Antioch and Jerusalem by burning the fire-temples of Ganzaca—the Median capital—and Thebarmes, the birthplace of the Persian prophet Zoroaster. Chosroës, as might have been expected, recalled his troops from the west, and fought two desperate battles to cover Ctesiphon. His generals were defeated in both, but the Roman army suffered severely. Winter was at hand, and Heraclius fell back on Armenia. In his next campaign he recovered Roman Mesopotamia, with its fortresses of Amida, Dara, and Martyropolis, and again defeated the general Shahrbarz.

But 626 was the decisive year of the war. The obstinate Chosroës determined on one final effort to crush Heraclius, by concerting a joint plan of operations with the Chagan of the Avars. While the main Persian army watched the emperor in Armenia, a great body under Shahrbarz slipped south of him into Asia Minor and marched on the Bosphorus. At the same moment the Chagan of the Avars, with the whole force of his tribe and of his Slavonic dependants, burst over the Balkans and beset Constantinople on the European side. The two barbarian hosts could see each other across the water, and even contrived to exchange messages, but the Roman fleet sailing incessantly up and down the strait kept them from joining forces.

In the June, July, and August of 626 the capital [pg 137] was thus beset: the danger appeared imminent, and the Emperor was far away on the Euphrates. But the garrison was strong, the patrician Bonus, its commander, was an able officer, the fleet was efficient, and the same crusading fervour which had inspired the Constantinopolitans in 622 still buoyed up their spirits. In the end of July 80,000 Avars and Slavs, with all sorts of siege implements, delivered simultaneous assaults along the land front of the city, but they were beaten back with great slaughter. Next the Chagan built himself rafts and tried to bring the Persians across, but the Roman galleys sunk the clumsy structures, and slew thousands of the Slavs who had come off in small boats to attack the fleet. Then the Chagan gave up the siege in disgust and retired across the Danube.

Heraclius had shown great confidence in the strength of Constantinople and the courage of its defenders. He sent a few veteran troops to aid the garrison, but did not slacken from his attack on Persia. While Shahrbarz and the Chagan were besieging his capital, he himself was wasting Media and Mesopotamia. He imitated King Chosroës in calling in Tartar allies from the north, and revenged the ravages of the Avars in Thrace by turning 40,000 Khazar horsemen loose on Northern Persia. The enemy gave way before him everywhere, and the Persians began to grow desperate.

Next year King Chosroës put into the field the last levy of Persia, under a general named Rhazates, whom he bid to go out and “conquer or die.” At the same time he wrote to command Shahrbarz to [pg 138] evacuate Chalcedon and return home in haste. But Heraclius intercepted the despatch of recall, and Shahrbarz came not.

Near Nineveh Heraclius fell in with the Persian home army and inflicted on it a decisive defeat. He himself, charging at the head of his cavalry, rode down the general of the enemy and slew him with his lance. Chosroës could put no new army in the field, and by Christmas Heraclius had seized his palace of Dastagerd, and divided among his troops such a plunder as had never been seen since Alexander the Great captured Susa.

The Nemesis of Chosroës' insane vanity had now arrived. Ten years after he had written his vaunting letter to Heraclius he found himself in far worse plight than his adversary had ever been. After Dastagerd had fallen he retired to Ctesiphon, the capital of his empire, but even from thence he had to flee on the approach of the enemy. Then the end came: his own son Siroes and his chief nobles seized him and threw him in chains, and a few days after he died—of rage and despair according to one story, of starvation if the darker tale is true.

The new king sent the humblest messages to the victorious Roman, hailing him as his “father,” and apologizing for all the woes that the ambition of Chosroës had brought upon the world. Heraclius received his ambassadors with kindness, and granted peace, on the condition that every inch of Roman territory should be evacuated, all Roman captives freed, a war indemnity paid, and the spoils of Jerusalem, including the “True Cross,” faithfully restored. [pg 139] Siroes consented with alacrity, and in March, 628, a glorious peace ended the twenty-six years of the Persian war.

Heraclius returned to Constantinople in the summer of the same year with his spoils, his victorious army, and his great trophy, the “Holy Wood.” His entry was celebrated in the style of an old Roman triumph, and the Senate conferred on him the title of the “New Scipio.” The whole of the citizens, bearing myrtle boughs, came out to meet the army, and the ceremony concluded with the exhibition of the “True Cross” before the high altar of St. Sophia. Heraclius afterwards took it back in great pomp to Jerusalem.

This was, perhaps, the greatest triumph that any emperor ever won. Heraclius had surpassed the eastern achievements of Trajan and Severus, and led his troops further east than any Roman general had ever penetrated. His task, too, had been the hardest ever imposed on an emperor; none of his predecessors had ever started to war with his very capital beleaguered and with three-fourths of his provinces in the hands of the enemy. Since Julius Caesar no one had fought so incessantly—for six years the emperor had not been out of the saddle—nor met with such uniform success.