Question: Oebares was a Persian officer of Cyrus II of Persia, commonly known as Cyrus the Great  and also called Cyrus the Elder by the Greeks, was the founder of which Empire?
Sentence (from "Cyrus the Great"): Under his successors, the empire eventually stretched at its maximum extent from parts of the Balkans (Bulgaria-Paeonia and Thrace-Macedonia) and Eastern Europe proper in the west, to the Indus Valley in the east.
Relevant evidence: No