besieging him in his residence in Heraion Teichos in 351, he forced the Thracian king to surrender and took his son as a hostage. Around this time, Philip also abolished Cetriporis' kingdom and deposed Amadocus II in favour of Teres II. After these events, the Thracian front remained peaceful until 347 or early 346, when the Athenians again attempted to strengthen their presence in Thrace, which they probably did at the request of Cersebleptes. Macedon expelled the Athenian garrisons and defeated the Odrysians, preventing yet again a Thraco-Athenian alliance against him. As a result of this campaign Philip also put the Aeagean coast as far east as Acontisma (not the banks of the Nestos river as often assumed) under direct Macedonian administration. A few years later Cersebleptes allied with Teres II and invaded the Chersonese, which was now under Macedon's protection. After asking the Persian king Artaxerxes III to cut the support of the Ionian towns for Cersebleptes, Philip finally felt confident enough to begin his most ambitious project so far: the conquest of inland Thrace in the form of a large campaign that would last from 342 to 340. Few details are known about this campaign. It seems to have started in May or June, when Philip's army penetrated the interior by marching upstream the Martisa river. The Odrysians resisted valiantly and confronted the Macedonians in many battles. Philip faced several setbacks and even seems to have lost at least one battle. By the spring of 341, fighting was still raging and Philip was forced to call in reinforcements. Although detailed evidence is lacking he finally managed to improve his situation and defeated Cersebleptes and Teres at some point between the second half of 341 and the first half of 340. Rise of the Getic kingdom The Getae, a northern Thracian people located between the northeastern foothills of the Haemus range and the lower Danube and the Black Sea, had been part of the Odrysian realm since Teres I, even though it is not clear how tightly they were actually incorporated into the state. When and how the Getae became independent is not discussed in the available sources. Perhaps they became independent during the rule of Cotys I or after his death in 360. Rich funeral treasures from the second half of the 4th century, like those of Agighiol, Peretu or Borovo, attest to the increasing wealth of the