 A modern historian, Erich S. Gruen, says that the fact that Demetrius of Macedon had to call the Illyrians to relieve Medion shows that he was incapable of doing so himself.This is supported by another historian, Grainger, who says that Demetrius was preoccupied in northern Macedon in a war against Dardania.As the Illyrians were also at war against the Dardanians, Grainger states it made Agron and Demetrius 'allies'.