The Parthian Army marched into Greece and sacked numerous towns. While involved in a bloody guerilla war in the mountains, they manage to destroy the Temple of Zeus in Olympia in 96 CE. The Greek Home Army retreats out of Greece itself and rebase in Epirus, launching a war into Roman Illyria.
After that and the invasion of southern Italy, the Romans decided to send envoys to Parthia to form an alliance to destroy the Hellenic Empire. The Romans promised them control over all lands east of Syria when control was wrested from the Greeks. Meanwhile, the Parthians consolidated their control over Asia Minor, Mesopotamia, and initiated their conquest of Syria and Judea. The King of Judea offered alliance and all of his male adults as soldiers in the service of the Parthians; Judea was granted relative independence and greatly expanded territory in Arabia and Palestine. Syria, Babylonia, Armenia, and Cappodocia were created as puppet states, and Iberia changed its allegiance. The fortunes of the Hellenic Empire began to shift violently against them, despite their holdouts in Asia minor and Western Greece. Egypt and Africa remained safe.
In 100 CE, the Greek army in Italy marched near Rome. The Roman home legions, small in number and led by Titus himself, met them in the field of battle near Lake Nemi. With better knowledge of the lay of the land, and skillful tactical manoeuvring, the Romans defeated the Greek forces. However, Titus was slain at the shores of the lake while engaging in personal combat. His brother, Titus Flavius Domitianus, became elected Dictator. He received notice after a string of great victories in Illyria and Dacia.
Domitianus arrived in Rome for his triumphal entry, acclaimed as dictator. In a public speech, he spoke of himself as the incarnation of Jupiter, there to deliver the Roman people from the menace of Greek invasion, referred to his fallen brother as a sacrificed "Rex Sacrorum" for his death at Nemi, and inferred that his election as a fraternal inheritance that ought to be akin to the Roman kingship.
The speech received thunderous applause from the Roman people and assembled soldiers. The senators were not as enthusiastic. In the following months, Domitianus initiated a purge of his political enemies and ambivalents. The army strongly supported him, giving him a great base of support as he led troops in the East. His governors kept order in the provinces, and in Rome.
But, even after ten more years of war, nothing had progressed. The lines remained static, and the Parthians continued to pump men into a gruelling war of occupation. The Greeks were stalled in all fronts, hardly able to react as their vast empire had its lines of communications blocked. Governors became almost like petty kings in and of themselves, setting the stage for a political splintering. While the Emperors dawdled in luxury and decadence in Alexandria, safe from battle and carnage.