Galicia and Poland, but may also have included parts of the modern
Hungary, they moved southwards and south-eastwards. They were presumably
in Dacia, north of the Danube, in the previous century, but they are first
mentioned as having crossed that river during the reign of the Emperor
Justin I (518-27). They were a loosely-knit congeries of tribes without
any single leader or central authority; some say they merely possessed the
instinct of anarchy, others that they were permeated with the ideals of
democracy. What is certain is that amongst them neither leadership nor
initiative was developed, and that they lacked both cohesion and
organisation. The Eastern Slavs, the ancestors of the Russians, were only
welded into anything approaching unity by the comparatively much smaller
number of Scandinavian (Varangian) adventurers who came and took charge of
their affairs at Kiev. Similarly the Southern Slavs were never of
themselves able to form a united community, conscious of its aim and
capable of persevering in its attainment.

The Slavs did not invade the Balkan peninsula alone but in the company of
the Avars, a terrible and justly dreaded nation, who, like the Huns, were
of Asiatic (Turkish or Mongol) origin. These invasions became more
frequent during the reign of the Emperor Justinian I (527-65), and
culminated in 559 in a great combined attack of all the invaders on
Constantinople under a certain Zabergan, which was brilliantly defeated by
the veteran Byzantine general Belisarius. The Avars were a nomad tribe,
and the horse was their natural means of locomotion. The Slavs, on the
other hand, moved about on foot, and seem to have been used as infantry by
the more masterful Asiatics in their warlike expeditions. Generally
speaking, the Avars, who must have been infinitely less numerous than the
Slavs, were settled in Hungary, where Attila and the Huns had been settled
a little more than a century previously; that is to say, they were north
of the Danube, though they were always overrunning into Upper Moesia, the