Illyricum

Roman province northwest of Macedonia. During the height of the Roman Empire (c. AD 117), when it included Dalmatia, Illyricum was bounded by the Adriatic Sea on the west and by the provinces of Pannonia on the north, Upper Moesia on the east, and Macedonia on the south. Today Slovenia, Croatia, Bosnia, and Yugoslavia occupy that territory.

Throughout the fourth century BC, the people of Illyricum warred with the Macedonians, until the Macedonian ruler Philip II defeated them in 359 BC. During the third century BC, their acts of piracy against Greek and Roman ships led to a war with Rome that continued on and off for 60 years (229–168 BC). After a series of revolts and sporadic Roman rule, Illyricum was officially made part of the empire in 11 BC and renamed Dalmatia. It took another 20 years for the people to be fully integrated into Roman culture.