Illyricum was a district of the Balkan Peninsula, which has varied in extent at different periods. To the Greek geographers Illyria meant the eastern shore of the Adriatic Sea and the adjoining mountainous territory stretching into the interior, all of which was the abode of Illyrian tribes.
During the time of the division of provinces under Hadrian, it was subdivided into seventeen provinces, comprising also Thrace. During Constantine the Great in A.D. 324 the Illyricum was one of four prefectures assigned to Western Rome.
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