The 7th century: the Heraclians and
the challenge of Islam
Heraclius and the origin of the themes
The most threatening problem Heraclius faced was the external menace
of the Avars and the Persians, and neither people abated its pressure
during the first years of the new reign. The Avars almost captured
the Emperor in 617 during a conference outside the long walls protecting
the capital. The Persians penetrated Asia Minor and then turned
to the south, capturing Jerusalem and Alexandria (in Egypt). The
great days of the Persian Achaemenid Empire seemed to have come
again, and there was little in the recent history of the Byzantine
emperors that would encourage Heraclius to place much faith in the
future. He clearly could not hope to survive unless he kept under
arms the troops he had brought with him; yet, the fate of Maurice
demonstrated that this would be no easy task, given the empire's
lack of financial and agricultural resources.
Three sources of strength enabled Heraclius to turn defeat into
victory. The first was the pattern of military government as he
and the nucleus of his army would have known it in the exarchates
of North Africa or Ravenna. As it had been in the West, so it now
was in the East. Civil problems were inseparable from the military:
Heraclius could not hope to dispense justice, collect taxes, protect
the church, and assure the future to his dynasty unless military
power reinforced his orders. A system of military government, the
exarchate, had accomplished these objectives so well in the West
that, in a moment of despair, Heraclius sought to return to the
land of his origins. In all likelihood, he applied similar principles
of military rule to his possessions throughout Asia Minor, granting
his generals (strategoi) both civil and military authority over
those lands that they occupied with their "themes," as the army
groups, or corps, were called in the first years of the 7th century.
Second, during the social upheaval of the previous decade, the
imperial treasury had doubtless seized the estates of prominent
individuals who had been executed either during Phocas' reign of
terror or after his death. In consequence, though the treasury lacked
money, it nonetheless possessed land in abundance, and Heraclius
could easily have supported with grants of land those cavalry soldiers
whose expenses in horses and armament he could not hope to meet
with cash. If this hypothesis is correct, then, even before 622,
themes, or army groups - including the guards (Opsikioi), the Armenians
(Armeniakoi), and the Easterners (Anatolikoi) - were given lands
and settled throughout Asia Minor in so permanent a fashion that,
before the century was out, the lands occupied by these themes were
identified by the names of those who occupied them. The Opsikioi
were to be found in the Opsikion theme, the Armeniakoi in the Armeniakon,
and the Anatolikoi in the Anatolikon. The term theme ceased thereafter
to identify an army group and described instead the medieval Byzantine
unit of local administration, the theme under the authority of the
themal commander, the general (strategos).
When Heraclius "went out into the lands of the themes" in 622,
thereby undertaking a struggle of seven years' duration against
the Persians, he utilized the third of his sources of strength:
religion. The warfare that ensued was nothing less than a holy war:
it was partly financed by the treasure placed by the church at the
disposal of the state; the Emperor's soldiers called upon God to
aid them as they charged into battle; and they took comfort in the
miraculous image of Christ that preceded them in their line of march.
A brief summary of the campaign unfortunately gives no idea of the
difficulties Heraclius encountered as he liberated Asia Minor (622);
fought in Armenia with allies found among the Christian Caucasian
peoples, the Lazi, the Abasgi, and the Iberians (624); and struggled
in far-distant Lazica while Constantinople withstood a combined
siege of Avars and Persians (626). An alliance with the Khazars,
a Turkic people from north of the Caucasus, proved of material assistance
in those years and of lasting import in Byzantine diplomacy. Heraclius
finally destroyed the main Persian host at Nineveh in 627 and, after
occupying Dastagird in 628, savoured the full flavour of triumph
when his enemy, Khosrow, was deposed and murdered. The Byzantine
emperor might well have believed that, if the earlier success of
the Persians signalized the resurrection of the Achaemenid Empire,
his own successes had realized the dreams of Caesar, Augustus, and
Trajan.
Yet this was a war fought by medieval Byzantium and not by ancient
Rome. Its spirit was manifest in 630, when Heraclius triumphantly
restored the True Cross to Jerusalem, whence the Persians had stolen
it, and - even more - when Constantinople resisted the Avar - Persian
assault of 626. During the attack, the patriarch Sergius maintained
the morale of the valiant garrison by proceeding about the walls,
bearing the image of Christ to ward off fire, and by painting upon
the gates of the western walls images of the Virgin and child to
ward off attacks launched by the Avars - the "breed of darkness."
The Avars withdrew when Byzantine ships defeated the canoes manned
by Slavs, upon whom the nomad Avars depended for their naval strength.
The latter never recovered from their defeat. As their empire crumbled,
new peoples from the Black Sea to the Balkans emerged to seize power:
the Bulgars of Kuvrat, the Slavs under Samo, and the Serbs and Croats
whom Heraclius permitted to settle in the northwest Balkans once
they had accepted Christianity.
As for the Byzantine defenders of Constantinople, they celebrated
their victory by singing Romanos' great hymn "Akathistos," with
choir and crowd alternating in the chant of the "Alleluia." The
hymn, still sung in a Lenten service, commemorates those days when
Constantinople survived as a fortress under ecclesiastical leadership,
its defenders protected by the icons and united by their liturgy.
This they sang in Greek, as befitted a people whose culture was
now Greek and no longer Latin.
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