The Donations of Alexandria of 34 BC. This is a rough sketch of mideast around this period and isn't 100% accurate, but is based on the proposal
Explanation: Much of Mark Anthony's reign as the effective ruler of the east was spent fighting Parthia, as it was a huge threat to the Roman East, besting Crassus in 53 BC, occupying the entire levant from 40-38 BC, and subsequently having hegemony over many client-states, Armenia being the most important one. He sent out on a campaign to conquer Parthia in 36 BC, but it was a massive failure because the Parthian cavalry intercepted and destroyed Anthony's baggage train and siege engines, and he ended up retreating through the Armenian mountains in winter, losing 32,000 troops in total. However, Anthony largely blamed the Armenian king Artavasdes II, who had retreated as defeat was imminent when the Parthians attacked. In 34 BC, Anthony successfully invaded Armenia and occupied it, capturing Artavasdes and the royal family, but then lost it again when Parthia reinvaded and installed his now anti-Roman son Artaxias II on the Armenian throne as a Parthian vassal.
While this was going on, Anthony and THE Cleopatra were having an affair that produced 3 children: Alexander Helios, Cleopatra Selene II, and Ptolemy Philadelphus. Cleopatra was very intelligent and had a huge sway over Anthony, given that they appeared to be lovers, used the now master of the Roman East to forward her own agenda (according to Augustan propaganda). Anthony appeared to be becoming more like an Egyptian, celebrating triumphs outside Rome and in Alexandria, dressing as an Egyptian, and worshiping their gods. It didn't help that he was also a god-awful politician. At any rate, the political fallout of the failed Parthian campaign and victorious Armenian campaign needed to be addressed, and so he celebrated a triumph outside Rome and executed the Armenian king. Then, Anthony and Cleopatra started to distribute Roman, Parthian and Egyptian territories to their various children:
- Alexander Helios received Armenia and Parthia (In Peach)
- Cleopatra Selene II received Cyrenaica (Green)
- Ptolemy Philadelphus received Syria and Cilicia (Purple)
- Caesarion (Cleopatra's and Caesar's child) was proclaimed King of Kings and King of Egypt, and would rule with his mother Cleopatra, who became Queen of Kings and Queen of Egypt (she already was Queen of Egypt), he also was confirmed as Caesar's legitimate heir rather than Octavian. (Grayish-blue, or whatever this color is called)
The Donations themselves were a massive failure and a political disaster for the ancient power-couple. The fallout was a breach between Anthony and Rome, and Octavian used it as a major stepping stone to war with Anthony. The main reason it was a failure because:
1. Octavian was already Caesar's legitimate heir, and Caesar didn't even acknowledge Caesarion, Anthony had no legal authority to revoke a will
2. He didn't control Parthia and Armenia was lost to them as well
3. The senate did not approve of Anthony giving away land and allegiances of vassal states that he could not legally give away
4. Octavian waged a massive propaganda campaign against Anthony, who largely was seen as Cleopatra's bootlicker, a situation made even worse by the fact that he didn't include any of his own children in the donations and ended up divorcing Octavia, Octavian's sister.