You can try to destroy all destructible buildings if it's revolting. It should revolt succesfully to Eleuthoroi. Bovi haven't clarified this to me but I saw Ptolemais-Theron rebelled to Eleuthoroi after I had taken it from Seleucid who took it from Ptoly who was eliminated. Before this my game crashed when Meroe was revolting but since I wanted to keep Meroe I didn't destroy any building except government ones. No harm in trying my suggestion.
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