Curtis and Maria Brosius state that Andragoras was not overthrown by the Arsacids until 238 BC. It is unclear who immediately succeeded Arsaces I. Bivar and Katouzian affirm that it was his brother Tiridates I of Parthia, who in turn was succeeded by his son Arsaces II of Parthia in 211 BC. Yet Curtis and Brosius state that Arsaces II was the immediate successor of Arsaces I, with Curtis claiming the succession took place in 211 BC, and Brosius in 217 BC. Bivar insists that 138 BC, the last regnal year of Mithridates I, is "the first precisely established regnal date of Parthian history." Due to these and other discrepancies, Bivar outlines two distinct royal chronologies accepted by historians. A fictitious claim was later made from the 2nd-century BC onwards by the Parthians, which represented them as descendants of the Achaemenid king of kings, Artaxerxes II of Persia (). For a time, Arsaces consolidated his position in Parthia and Hyrcania by taking advantage of the invasion of Seleucid territory in the west by Ptolemy III Euergetes (r. 246–222 BC) of Egypt. This conflict with Ptolemy, the Third Syrian War (246–241 BC), also allowed Diodotus I to rebel and form the Greco-Bactrian Kingdom in Central Asia. The latter's successor, Diodotus II, formed an alliance with Arsaces against the Seleucids, but Arsaces was temporarily driven from Parthia by the forces of Seleucus II Callinicus (r. 246–225 BC). After spending some time in exile among the nomadic Apasiacae tribe, Arsaces led a counterattack and recaptured Parthia. Seleucus II's successor, Antiochus III the Great (r. 222–187 BC), was unable to immediately retaliate because his troops were engaged in putting down the rebellion of Molon in Media. Antiochus III launched a massive campaign to retake Parthia and Bactria in 210 or 209 BC. Despite some victories he was unsuccessful, but did negotiate a peace settlement with Arsaces II. The latter was granted the title of king (Greek: basileus) in return for his submission to Antiochus III as his superior. The Seleucids were unable to further intervene in Parthian affairs following increasing encroachment by the Roman Republic and the Seleucid defeat at Magnesia in 190 BC. Priapatius (r. c. 191–176 BC) succeeded Arsaces II, and Phraates I (r. c. 176–171 BC) eventually ascended the Parthian throne. Phraates I ruled Parthia without further Seleucid interference. Expansion and consolidation Phraates I is recorded as expanding Parthia's control past