Diomedes 1. King of the Bistonians in Thrace and notorious owner of man-eating mares. One of HERACLES 1‘S LABOURS was to bring these mares from Thrace to Mycenae. Diomedes 1 was killed by Heracles 1 or, as they say, devoured by his mares. He was the son of Ares and Cyrene, daughter of Hypseus 1, son of Peneus, one of the RIVER GODS [see also HERACLES 1‘S LABOURS] [Apd.2.5.8; Dio.4.15.2].

Polymestor 1 (Polymnestor). This is the king of the Bistonians in Thrace who should have taken care of Polydorus 3, whom his father Priam 1 had sent far away from the Trojan War, but who, tempted by the treasure Polydorus 3 had brought, killed him. For along with Polydorus 3Priam 1 sent to Thrace a secret store of gold, which, if ever Troy should fall, could help to rescue the remains of his house. While Troy stood firm and was still strong, Polydorus 3 lived a happy life in King Polymestor 1‘s palace. But when Hector 1 and King Priam 1 himself were killed and Troy was sacked, Polymestor 1, in order to get the Trojan gold, murdered his guest, throwing his body into the sea. The corpse of Polydorus 3 appeared in the shore, close to the place where the Achaean army was encamped, and delivered to his mother, the former Queen of Troy, who was now a prisoner. Warned by a dream Hecabe 1 understood who the murderer was and which his motive. And wishing to avenge his son, she planned the ruin of this false and perjured friend who had committed such a black treachery, without fearing the powers below nor those above. For this purpose she sent a messenger to Polymestor 1, begging him to come and bring his sons, so that all would listen to something she had to tell them. Agamemnon was fully informed by Hecabe 1 of the crime perpetrated by Polymestor 1 and having at the moment the queen’s daughter Cassandra lying by his side in bed, was inclined to put things aright, even though he was reluctant to invite criticism from the Achaeans, who regarded Polymestor 1 as an ally. In any case Agamemnon did not oppose her and provided the messenger with safe-conduct through the camp. Then Hecabe 1 fabricated a story about a store of gold buried long ago in the place in Troy where once Athena‘s temple stood, asking Polymestor 1 to take charge of some items, belonging to that treasure, which she had brought with her when leaving Troy, and that now were hidden in her tent. Lured by her tales of gold treasured by Priam 1‘s family, the Thracian king and his two sons were brought alone into the tent, where they were murdered by Hecabe 1 and the Trojan women that were with her. Yet others have said that when Polydorus 3 was born, his father Priam 1 gave him to his daughter Iliona, who was married to King Polymestor 1. Iliona, who was Polydorus 3‘s sister, brought him up as her own son; and the son Deipylus 1 that she had by Polymestor 1, she brought as if he were her brother, thinking that if anything happened to either of them, she could give the other to her parents at Troy. Now, when Troy was sacked, the Achaeans purposed to destroy the house of Priam 1 and that is why, they say, they murdered little Astyanax 2, the son of Hector 1. With regard to Polydorus 3 the Achaeans sent messengers to King Polymestor 1, promising him Electra 2, daughter of Agamemnon, in marriage, together with a large amount of gold, if he would kill Polydorus 3. Polymnestor 1, they say, found the offer attractive and slew his own son Deipylus 1 unwittingly, thinking he had killed Polydorus 3. In the meantime this young man had gone to the Oracle at Delphi and, having inquired about his parents, he learned that his city was burned, his father dead, and his mother held in servitude. When Polydorus 3 returned home to Thrace, not knowing that he came originally from Troy and believing Polymestor 1 and Iliona to be his parents, he thought that the Oracle had spoken falsely. However, his sister Iliona, who later committed suicide on account of the misfortunes of her family, revealed the truth and, following her advice, Polydorus 3 blinded Polymestor 1 and killed him [Eur.Hec.24 and passim.; Hyg.Fab.109, 240; Ov.Met.13.430ff.; Prop.3.13.55].