Antiochus I of Commagene mother Laodice VII Thea
Family, ancestry and early life
Antiochus I was the son of king Mithridates I Callinicus and queen Laodice VII Thea of Commagene. Antiochus was half Iranian, a distant member of the Orontid Dynasty and half Greek. Antiochus' father Mithridates was the son of King Sames II Theosebes Dikaios of Commagene and an unidentified woman. Mithridates was possibly related to the kings of Parthia and, in the light of archaeological discoveries at Mount Nemrut, claimed descent from Orontes and also claimed Darius I of Persia as an ancestor, thanks to Orontes' marriage to Rhodogune, daughter of Artaxerxes II, who was a descendant of king Darius I.
More certain are his dynastic connections to the Diadochi. Antiochus’ mother, Laodice VII Thea, was a Greek princess of the Seleucid Empire. Laodice's father was the Seleucid King Antiochus VIII Grypus, while her mother was a Ptolemaic princess and later Seleucid Queen Tryphaena (see Cleopatra VI of Egypt). Thus, Antiochus was a direct descendant of Seleucus I Nicator of the Seleucid Empire, Ptolemy I Soter of Egypt, Antigonus I Monophthalmus of Macedonia and Asia, Lysimachus of Thrace and the Macedonian regent, Antipater. These five men, the Diadochi 'successors', had served as generals under Alexander the Great. Antiochus’ parents had married as part of a peace alliance between their kingdoms. Little is known of his early life and education, aside from its philhellenic aspect; however, it seems that when his father died in 70 BC, Antiochus succeeded his father as king.
Antiochus married Isias, daughter of King Ariobarzanes I of Cappadocia. They had five children:
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