that he would respect their autonomy and freedom (he had not respected the autonomy of the cities which were synoikized to create Antigoneia). The koinon continued to function until at least the 1st century AD and primarily consisted of cities from the Troad, although for a time in the second half of the 3rd century it also included Myrlea and Chalcedon from the eastern Propontis. The governing body of the koinon was the synedrion on which each city was represented by two delegates. The day-to-day running of the synedrion, especially in relation to its finances, was left to a college of five agonothetai, on which no city ever had more than one representative. This system of equal (rather than proportional) representation ensured that no one city could politically dominate the koinon. The primary purpose of the koinon was to organize the annual Panathenaia festival which was held at the sanctuary of Athena Ilias. The festival brought huge numbers of pilgrims to Ilion for the duration of the festival as well as creating an enormous market (the panegyris) which attracted traders from across the region. In addition, the koinon financed new building projects at Ilion, for example a new theatre c. 306 and the expansion of the sanctuary and temple of Athena Ilias in the 3rd century, in order to make the city a suitable venue for such a large festival. In the period 302–281, Ilion and the Troad were part of the kingdom of Lysimachus, who during this time helped Ilion synoikize several nearby communities, thus expanding the city's population and territory. Lysimachus was defeated at the Battle of Corupedium in February 281 by Seleucus I Nikator, thus handing the Seleucid kingdom control of Asia Minor, and in August or September 281 when Seleucus passed through the Troad on his way to Lysimachia in the nearby Thracian Chersonese Ilion passed a decree in honour of him, indicating the city's new loyalties. In September Seleucus was assassinated at Lysimachia by Ptolemy Keraunos, making his successor, Antiochus I Soter, the new king. In 280 or soon after Ilion passed a long decree lavishly honouring Antiochus in order to cement their relationship with him. During this period Ilion still lacked proper city walls except for the crumbling Troy VI fortifications around the citadel, and in 278 during the Gallic invasion the city was easily sacked. Ilion enjoyed a close relationship with Antiochus for