Information about the Orontids is fragmentary, and historians' reconstruction of their history and genealogy is tentative and mainly based on evidence from inscriptions and coins. In particular, the inscriptions left by the Orontid king
Antiochus I of Commagene () at
Mount Nemrut contain the most information about the genealogy of the Orontids. Their presence as a ruling dynasty in Armenia can be traced back to at least 400 BC, at which time
Orontes I appears as the
Satrap of Armenia under the
Achaemenid Empire. In his largely fictional
Cyropaedia, the Greek author
Xenophon (died ) mentions
Tigranes, the son of an unnamed king of Armenia, who was a friend of
Cyrus the Great (), the founder of the Achaemenid Empire. Tigranes was the name of later Armenian monarchs of the
Artaxiad dynasty (probably a branch of the Orontids). The later Armenian historian
Movses Khorenatsi, possibly drawing from a common tradition as Xenophon, writes of an Armenian king named Tigran (Tigranes), the son of King
Eruand (Orontes) the Short-Lived. Khorenatsi's Tigran allies with Cyrus the Great against the Median king
Astyages. According to
A. Shapour Shahbazi, Xenophon's account of Tigranes is fictional, and Xenophon based Tigranes on a contemporary of the same name who was a son-in-law of the Achaemenid satrap
Struthas.
Suren Yeremian used Xenophon's and Khorenatsi's accounts to argue that Eruand the Short-Lived and his son Tigran were actual Orontid kings of Armenia in the 6th century BC. In
Cyril Toumanoff's view, the succession of Tigran after Eruand in Khorenatsi's version allegorically represents the Artaxiad dynasty succeeding the Orontids. Commenting on Khorenatsi's account,
Igor M. Diakonoff did not rule out that the Orontids had married into a pre-existing Armenian royal house. Xenophon's contemporary
Orontes I, satrap of Armenia, is regarded as the ancestor of the later Orontid rulers; it is possible that the Orontids were already established in Armenia before him. Orontes was the son of a
Bactrian nobleman,
Artasyrus, and claimed descent from
Hydarnes, presumably through the maternal line. Hydarnes was one of the "Seven Persians" who overthrew
Bardiya and placed
Darius the Great on the Achaemenid throne in 522 BC. After Darius's takeover, Armenia revolted and was subdued after three Persian campaigns, led by the Armenian
Dadarshish. Hydarnes may have been granted the Satrapy of Armenia as a quasi-hereditary office. A later
Hydarnes, who married his daughter to
Artaxerxes II (), may have been a descendant of the first Hydarnes and served as Satrap of Armenia. In 401 BC, Orontes I appears as the Satrap of Armenia and the son-in-law of Artaxerxes II, having married the latter's daughter
Rhodogune. This Orontes is frequently mentioned in accounts of Persian affairs in the first half of 4th century BC. He fought against the
Ten Thousand Greeks during their escape through Armenia. At this time, Armenia was organized into two satrapies, divided by the
Teleboas River: one ruled by Orontes, and another, distinguished as "Western" Armenia, ruled by
Tiribazus. Orontes led the Persian infantry against
Evagoras, the King of
Salamis on Cyprus, after which he lost Artaxerxes's favor. He later reappears as the subordinate governor of a coastal province. He led revolt against the king but ultimately made peace with him. He died . During the reign of
Artaxerxes III, the Satrapy of Armenia was granted to Artashata, a member of the Achaemenid dynasty who later ruled the empire as
Darius III. The next known Orontid satrap of Armenia is
Orontes II, a son or grandson of Orontes I. He led the Armenian contingent in Darius III's army at the
Battle of Gaugamela. Another Armenian commander is mentioned is mentioned in this context, Mithraustes, who may have been the satrap of another part of Armenia. After conquering the Achaemenid Empire,
Alexander the Great appointed as Satrap of Armenia
Mithrenes, a satrap of
Sardis who had defected to his side. Some historians doubt whether Mithrenes ever actually ruled in Armenia, as the Macedonians never established firm control over the country. In Cyril Toumanoff's view, Mithrenes was actually a member of the Orontid dynasty. The Mount Nemrut inscriptions bear a partially legible name following that of Orontes II, which one scholar read as
Mithranes. More recent studies have identified the name as ending in
-danes (perhaps
Bardanes), referring to a son of Orontes II. An
Orontes (III) is mentioned by
Diodorus Siculus as ruling Armenia in about 316 BC. The Macedonian general
Neoptolemus is mentioned as Satrap of Armenia not long after the death of Alexander the Great, but he seems to have failed to take control of the country, possibly because of Orontes's resistance. Diodorus also refers to Ardoates, whom he calls King of Armenia, and who helped
Ariarathes II of Cappadocia break away from the Seleucids. This probably happened after the
Battle of Corupedium. According to Toumanoff, this "Ardoates" is identical with Orontes III. Regardless of their formal submission to more powerful rulers, the Orontids ruled as kings in practice and presented themselves as kings. tomb relief. held at the National Library, Paris, dated to 362 BC. Starting from 301 BC Armenia is included within the sphere of influence of the
Seleucid Empire, but it maintained a considerable degree of autonomy, retaining its native rulers. According to
Polyaenus, in 227 BC the Seleucid rebel king
Antiochus Hierax took refuge in Armenian territory governed by King Arsames, founder of the city
Arsamosata. Towards the end of 212 BC the country was divided into two kingdoms, both vassal states of the Seleucids: Greater Armenia and Armenia Sophene, including Commagene or Armenia Minor.
Antiochus III the Great decided to suppress the local dynasties, and besieged Arsamosata. Xerxes, the satrap of Sophene and Commagene, surrendered and implored the clemency of the king, whom he accepted as his sovereign. Antiochus gave his sister Antiochis as a wife to Xerxes; she would later murder him. Greater Armenia was ruled by an Orontid descendant of Hydarnes, the last Orontid ruler of Greater Armenia (Strabo xi.14.15); he was apparently subdued by Antiochus III the Great, who then divided the land between his generals
Artaxias (Artashes) and
Zariadres (Zareh), both of whom would claim descent from the Orontid family. ==Orontids of Commagene==