Having obtained the desired rapprochement with the Romans,
Phraates IV turned his attentions to internal matters. As always first and formeost in his thoughts was the safety of his crown and the succession to it. The death of his eldest sons at Damascus had left him without a clear heir and successor. The Arsacid succession was preferably, but not necessarily, determined along the lines of primogeniture, with preference given to sons born to wives of the royal blood. The King named his successor, though the Megistanes and Senate had a considerable say in the confirmation, ascension and deposition of monarchs.
By his chief sister-wife
Olenieire, Phraates had sired five children, three sons:
Vonones, Saraspades and
Rhodaspes, and two daughters,
Cassandane and
Palmide. Of these, Vonones and Saraspades perished at Damascus and Rhodaspes was, in 24BC, not yet of marriageable age. Cassandane had married her brother Vonones and Palmide was given to Darius, King of Media Antropatene.
By another sister,
Baseirta, Phraates had sired another son,
Phraanes (also perished at Damascus) and a daughter,
Ocha. By his niece,
Bistheibanaps, he had a son,
Cerospades, and two daughters,
Sayarsis and
Sisygambis. His fourth official wife was a princess by the name
Cleopatra, not to be confused with the Egyptian Queen. She was the daughter of Seleucus, son of the Parthian princess Rhodogune and Demetrius II, who had been raised in Parthia and became a Parthian prince after his father shamelessly abandoned Rhodogune and her children. By this Cleopatra he had two daughters,
Parmys and
Laodike, and two young sons,
Pharasmanes and
Mnasciras.
Phraates also had various other lesser wives - several daughters of Mithridates III and various concubines of various ethnicities, the daughters of allied and subject chiefs and princes. By these he had yet other children, counted illegitimate, and amongst whom there was no son of reasonable age.
When
Cleopatra VII Tryphaena had first came into Parthia at the side of Oxyartes Suren, Phraates had put away his three wives - Olienieire, Bistheibanaps and Cleopatra (Baseirta being already deceased) - to take her as his sole wife and queen. He subsequently divorced her and sent her away to the far-flung city of Bactria, which she ruled alongside his son Saraspades. Paranoid to the utmost and distrustful of all, Phraates took his daughter Sayarsis as his queen, not trusting any other to share his bed and intimacy. In this way he officialized the great power and influence she already had at court.
Despite Sayarsis' protests, Phraates followed up the Roman campaign with another purge of the royal clan. Having obtained the custody of two adolescent sons of his slain rival Tiridates, he had the two thrown into a flaming hot furnace. Similar fates befell sixty other more remotely related noblemen of the royal clan, their children and wives. Among their number was Monaeses, who Phraates had previously pardoned and pledged to treat kindly. When the Kings of Adiabene and Arbela escaped from the cages in which he had put them, he blamed his adolescent son
Ceraspades. The teenage boy was publicly castrated and maimed before being stoned to death.
Perhaps it had escaped Phraates' deranged mind completely, but young Ceraspades was the beloved full-brother of his Queen Sayarsis. Distraught, Sayarsis convoked what she could of the Megistanes; with their support, she deigned to depose her father, avenge her brethren and take a husband with which to continue the royal line.
Catching wind of the conspiracy, Phraates fled to Seistan to seek the aid of the Suren Oxyartes. He found Oxyartes embroidled in his own personal dynastic conflicts and so made haste to Bactria, where he put himself at the mercy of the Queen Cleopatra VII. He was now convinced that the Magi had tricked him and that he had lost the throne by putting her away; she was Isis, Nanaya, the Queen of Heaven - how could sharing her bed be a bad omen? If not marry her himself, at very least he could not allow any other prince to marry her, Goddess incarnate and daughter of Alexander, for then they would certainly put him and the Arsacid line aside and establish a new house.
Stranded without allies in Bactria, Cleopatra welcomed Phraates and the small army he had with him with open arms. From Bactria he called upon his Dahae allies, requesting their aid against his rebellious daughter and nobles. The Dahae chiefs pledged their support - not so much out of the love they bore Phraates, but out of newfound devotion to Cleopatra. Cleopatra's son Alexander was highly popular with the Dahae, amongst whom he had spent the previous years and whose ways he had adopted in his manners and dress. The Dahan chiefs had heard from Alexander of how his mother was called Queen of Heaven and worshipped as Isis by the Romans and Greeks alike, and from the courtiers of Phraates of how even the magi had accorded her certain divine status. When an embassy of their seers and chiefs sought Phraates out in Bactria, they were in awe of the great Queen and worshipped her as their goddess Nanaya incarnate. Nanaya, the warlike Queen of Heaven known for her sensuality and voluptuousness, was easy to equate with Cleopatra, who possessed all of the same qualities and who further ingratiated herself with the Parthians by her great hatred of the Romans.
Phraates called upon Suren to annoint and crown Alexander as crown prince, and married the youth to his daughter Cassandane, widow of the previous crown prince Vonones. To Alexander were given certain privileges reserved for the king alone, such as the right to sleep on a bed made of pure gold, and the youth was invested with the province of Hyrcania to rule.
The Magi crown Rhodaspes as King
Spurred on by Sayarsis and offended by their King's actions, the Megistanes officially deposed Phraates and elected to the throne the boy Rhodaspes. Word from Phraates that he now divorced Sayarsis - effected prior to the date of his deposition - was conveniently ignored. In the absence of Suren, the chief Magus crowned the boy Rhodaspes himself. Sayarsis remained as Queen and automatically transferred her matrimony from Phraates to Rhodaspes. She was given unprecedented powers as Queen and presented as divine herself, in order to present a rival cult to that of Cleopatra as Nanaya.
Unfortunately, Sayarsis' overtures of cooperation to her brother-in-law Darius of Media Antropatene were misunderstood, or more likely, ignored. Taking advantage of the chaos enveloping Parthia, he invaded from the north, bringing to heel the Kings of Osrhoene and Armenia and adopting the title,
King of Kings. He was, after all, closely related to the Arsacids and descended - as they did, or pretended to do so - through the male line from the old Achaeminid house.
Darius met with little opposition, going so far as to expell Sayarsis and Rhodaspes and take Ctesiphon. The royal couple and a rump court fled to the ever-receptive court of Kamnaskires IV of Elam. His Mesopotamian conquest was short-lived: back in Media his brother
Ariobarzanes II had usurped the throne, whilst in Babylon two Jewish brothers
Anilai and
Asinai established themselves as independent rulers. The two soundly defeated the force Darius sent against them, contributing to that King's hasty retreat back to Antropatene. He left behind in Ctesiphon his son,
Mithridates IV, as nominal King of Parthia, though in reality the boy's partisans controlled but a small strip of Mesopotamia.
Eager to play King-maker,
Kamnaskires IV of Elam threw Rhodaspes in jail and attempted to force Sayarsis into a marriage with himself. The Parthian Queen fled, hoping for a positive reception in Ctesiphon, but she was sorely disappointed upon her arrival: Anilai and Asinai had taken the city and held the young Mithridates IV captive. As a Dahae army crossed the desert from Hyrcania against them, Anilai and Asinai forced the conversion of Sayarsis and Mithridates to the Jewish faith, along with the King of Adiabene who was also in their power.