Nicomedes III Euergetes ("the Benefactor", ) was the king of Bithynia, from c. 127 BC to c. 94 BC. He was the son and successor of Nicomedes II of Bithynia. Life Memnon of Heraclea wrote that Nicomedes IV was the son of Nicomedes III with his wife Nysa but according to Granius Licinianus, Nicomedes IV was his son by an earlier wife called Aristonica who died nine days after her son's birth. He then married Nysa, the daughter of Ariarathes VI of Cappadocia and, Laodice of Cappadocia, the sister of Mithridates V of Pontus. Both Nicomedes III and Nysa shared a lineage from the Seleucid dynasty of the Seleucid Empire. He and Nysa likely had a daughter also named Nysa. Nicomedes also had another son, Socrates Chrestus, from a concubine called Hagne who was from Cyzicus. He sent Socrates and Hagne to Cyzicus with 500 talents. His third wife was Laodice of Cappadocia, his former mother-in-law. Nicomedes and Mithridates VI of Pontus made an alliance. The latter invaded Paphlagonia and drove its ruler, who descended from Pylaemenes, out. The two kings partitioned it among themselves. Mithridates VI had Ariarathes VI of Cappadocia (the husband of Laodice and father of Nysa) murdered by a certain Gordius in 116 BC. Afterwards he decided to remove (i.e. murder) the young sons of Ariarathes VI and Laodice as he thought that his gains from the murder, the control of Cappadocia, might be lost if they would turn against him. However, Nicomedes invaded Cappadocia "while it was left defenceless by the death of its sovereign." Mithridates VI sent assistance to his sister “on pretence of affection for her, to enable her to drive Nicomedes out of Cappadocia.” However, Laodice made an agreement to marry Nicomedes . An angry Mithridates drove Nicomedes out and restored Ariarathes VII, the son of Laodice. After this he murdered Ariarathes VII of Cappadocia and installed his son on the Cappadocian throne as Ariarathes IX under the guardianship of Gordius. In 100 BC, after the murder of Ariarathes VII the Cappadocians revolted against Mithridates VI and called his for brother, Ariarathes VIII of Cappadocia, who was in Pergamon for his education, to return to Cappadocia to become king. Mithridates invaded Cappadocia and drove him out. Ariarathes VIII died in 96 BC. With his death, his dynasty died out. Nicomedes III now feared that Mithridates would invade Bithynia. He pretended that Laodice