manpower to hold Parthia and also keep the Ptollemies and others at bay.
Dynastic strife? Thats why the Antigonids were better statesmen is it not? They could do more with less!
You don't see them fighting with each other like the Seleucids did. If only they had won at Ipsus.
Its hard to see the Hellenistic world going down like it did if the Antigonids had been in charge. Oh well!
I think its too easy (and incorrect) to solely blame the Romans for the decline of the Seleucid empire.
The Seleucids really only have themselves to blame in my opinion. They failed to see the bigger picture.
You say that trying to hold onto the east was not costly. Antiochus VII lost as many as 300,000 people in his failed attempt to take back the east from the Parthians. Demetrius II was captured by the Parthians.
Who knows how many men he lost? And the loss of Asia Minor?
The price of trying to hold onto the east was too much. It took focus away from the west.
Also, the size of the Empire that made so much discord easy. What was the material gain to be had in the east that could match the cost of trying to maintain control? Nothing is the answer.