Meanwhile the Illyrians had seized Pelion (Pliassa), which commanded the passes on the west of Macedonia, and from the Danube Alexander marched straight thither over the hills.
In the spring of 334, Alexander crossed with an army of between 30,000 and 40,000 men, Macedonians, Illyrians, Thracians and the contingents of the Greek states, into Asia.
They are probably the descendants of the earliest Aryan immigrants, who were represented in historical times by the kindred Illyrians, Macedonians and Epirots; the Macedonians and Epirots are believed by Hahn to have formed the core of the pre-Hellenic Tyrrheno-Pelasgian population which inhabited the southern portion of the peninsula and extended its limits to Thrace and Italy.
The Illyrians were also "Pelasgian," but in a wider sense.
Of these cognate races, which are described by the Greek writers as barbarous or non-Hellenic, the Illyrians and Epirots, he thinks, were respectively the progenitors of the Ghegs, or northern, and the Tosks, or southern, Albanians.
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