The Slavs under name of the Antes and the Sclaveni make their first appearance in Byzantine records in the early 6th century. Byzantine historiographers under Justinian I (527–565), such as Procopius of Caesarea, Jordanes and Theophylact Simocatta describe tribes of these names emerging from the area of the Carpathian Mountains, the lower Danube and the Black Sea, invading <answer>the Danubian provinces</answer> of the Eastern Empire.
Tribes of Slavs were invading what provinces of the Eastern Empire?
the Danubian provinces