for battle against the Leagues the next day which he believed he would win. Orders to withdraw arrived from Teuta because some of the revolting Illyrians within the Ardiaean State had joined the influential Dardanian State under Longarus who wanted to invade the northern regions of Teuta's state. Scerdilaidas was forced to return and secure the Ardiaean State's northern borders from Longarus. As Scerdilaidas marched north, Teuta secured a peace treaty in favour of the Ardiaean State. While still in Epirus Scerdilaidas led a fleet of lembi on the Ionian Sea and swept through Corfu and Onchesmos and intercepted and plundered some merchant vessels of Rome. After the defeat of Teuta during the First Illyrian War in 228 BC, young Pinnes, formally King of Illyria under Teuta's regency, was confirmed to remain king of a limited Ardiaean State by the victorious Romans. Soon the regency was taken over by Demetrius of Pharos, who married Pinnes' mother, Triteuta, the divorced wife of Scerdilaidas' brother Agron. This happened most probably without consent of Rome, even if Demetrius was their ally. Under Demetrius In 220 BC Demetrius and Scerdilaidas made a joint expedition down the Ionian coast to the Peloponnese with 90 lembi, and thus Demetrius violated the treaty with Rome by sailing south of the coastal city of Lissus. After an assault on Pylos in the western Peloponnese was successful, they divided their force. Demetrius with fifty ships sailed on a raiding expedition in the Aegean against the Cyclades, while Scerdilaidas with the remaining forty ships agreed to support the Aetolians in an invasion of the Achaean League. On putting in at Naupactus, Scerdilaidas was encouraged by his brother-in-law Amynas, king of the Athamanes, to join them in the planned invasion of Achaea. Scerdilaidas and his allies also attacked but failed to take Cleitor. While Scerdilaidas collaborated with the Aetolians, Demetrius was persuaded to assist the Macedonian cause against Aetolia on his return via the Isthmus of Corinth. Demetrius returned to the Ardiaean State and began to revive Illyrian power. However, he was beaten by the Romans in 219 BC during the Second Illyrian War. Relations with Macedon After the Second Illyrian War, Pinnes was again proclaimed king. Pinnes was not favoured among the Illyrians and in 218 BC Scerdilaidas took over his nephew's role and became king. Under pressure from the Carthaginians in Spain, the Romans did not intervene. In 220