The Greek political balance between Macedon under Philip V and the Aetolian League was upset by the war between Rome and Carthage.
Fearing that Philip could offer overt military assistance, Rome hoped to confine the Macedonians to the east of the Roman province of Illyria.
Between 214 and 212 BC, Philip made two unsuccessful attempts to invade Illyria by sea and halting progress by ground, eventually succeeding in capturing the port of Lissus and gaining the province's capitulation.
In the end, the Macedonians largely regained their original position, and the Romans and Aetolians were ready to make peace.
The treaty formally acknowledged the favorable position of Macedonia, including the capture of Illyria, but Philip effectively repudiated his alliance with Hannibal.