=Arsăces=, a man of obscure origin, who, upon seeing Seleucus defeated by the Gauls, invaded Parthia, and conquered the governor of the province called Andragoras, and laid the foundations of an empire, 250 B.C. He added the kingdom of the Hyrcani to his newly acquired possessions, and spent his time in establishing his power, and regulating the laws. After death he was made a god of his nation, and all his successors were called, in honour of his name, _Arsacidæ_. _Justin_, bk. 41, chs. 5 & 6.――_Strabo_, bks. 11 & 12.――――His son and successor bore the same name. He carried war against Antiochus the son of Seleucus, who entered the field with 100,000 foot and 20,000 horse. He afterwards made peace with Antiochus, and died B.C. 217. _Justin_, bk. 41, ch. 5.――――The third king of Parthia, of the family of the Arsacidæ, bore the same name, and was also called Priapatius. He reigned 12 years, and left two sons, Mithridates and Phraates. Phraates succeeded as being the elder, and at his death he left his kingdom to his brother, though he had many children; observing that a monarch ought to have in view, not the dignity of his family, but the prosperity of his subjects. _Justin_, bk. 31, ch. 5.――――A king of Pontus and Armenia, in alliance with the Romans. He fought long with success against the Persians, till he was deceived by the snares of king Sapor, his enemy, who put out his eyes, and soon after deprived him of life. _Marcellinus._――――The eldest son of Artabanus, appointed over Armenia by his father, after the death of king Artaxias. _Tacitus_, _Histories_, bk. 6.――――A servant of Themistocles. =Arsacĭdæ=, a name given to some of the monarchs of Parthia, in honour of Arsaces, the founder of the empire. Their power subsisted till the 229th year of the christian era, when they were conquered by Artaxerxes king of Persia. _Justin_, bk. 41. =Arsamĕnes=, a satrap of Persia, at the battle of the Granicus. =Arsametes=, a river of Asia, near Parthia. _Tacitus_, _Annals_, bk. 15. =Arsamosāta=, a town of Armenia Major, 70 miles from the Euphrates. _Tacitus_, _Annals_, bk. 15. =Arsānes=, the son of Ochus and father of Codomanus. =Arsanias=, a river of Armenia, which, according to some, flows into the Tigris, and afterwards into the Euphrates. _Pliny_, bk. 5, ch. 24. =Arsēna=, a marsh of Armenia Major whose fishes are all of the same sort. _Strabo._ =Arses=, the youngest son of Ochus, whom the eunuch Bagoas raised to the throne of Persia, and destroyed with his children, after a reign of three years. _Diodorus_, bk. 17. =Arsia=, a wood of Etruria, famous for a battle between the Romans and the Veientes. _Plutarch_, _Poplicola_.――――A small river between Illyricum and Istria, falling into the Adriatic.――――A river of Italy, flowing through Campania. =Arsidæus=, a son of Datames, &c.