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So, i once posted a thread about Roman emperor Licinius managing to defeat and kill Constantine at the Battle of Cibalae (314 AD), causing him to gain control of the whole empire and ultimately emerge victorious from the Civil Wars of the Tetrarchy. But, i'll posit another question for now, within a later scenario.
What if Licinius had managed to defeat pro-Constantinian forces at either Chrysopolis or Hellespont (both battles at 324 AD), or both? By this timeframe, Licinius was already controling a reduced share of the empire composed of Egypt and the Asian provinces, and was fighting a defensive war against Constantine, the aggressor. Could he recapture the Balkans, or not? Could a proper peace treaty be signed between both emperors?
 
One alternative could be for him to build walls around Byzantium (or Licinianople?) such that Constantine couldn't reach Asia or Egypt without an amphibious landing, which Licinius would presumably have the naval power to avert. If Licinius holds out for long enough, the Germanic peoples would start to harass Constantine's extremely long northern border and his attention might be diverted, prolonging the life of Licinius' empire
 
So, i once posted a thread about Roman emperor Licinius managing to defeat and kill Constantine at the Battle of Cibalae (314 AD), causing him to gain control of the whole empire and ultimately emerge victorious from the Civil Wars of the Tetrarchy. But, i'll posit another question for now, within a later scenario.
What if Licinius had managed to defeat pro-Constantinian forces at either Chrysopolis or Hellespont (both battles at 324 AD), or both? By this timeframe, Licinius was already controling a reduced share of the empire composed of Egypt and the Asian provinces, and was fighting a defensive war against Constantine, the aggressor. Could he recapture the Balkans, or not? Could a proper peace treaty be signed between both emperors?

I think Licinius could easily have won and killed Constantine in the 314-17 war. Constantine was over confident only bringing a small army and navy, Licinius also had the advantage of being on the defense and having the ability to march on Constantine's rear as he demonstrated after Mardia. The 324 seems like it would be much more difficult since Constantine built up a well trained army and navy. If Licinius does manage to win at Adrianople I could see him getting off with a status quo agreement due to his wife being Constantine's sister.

Would Constantine attempt to make a short alliance with Persia in order to defeat Licinius, offering them some border territories?

I don't think that would be possible. Persia is in bad straights at that point still recovering from the drumming Galerius gave them. Also Shapur II is very young and the country is in the hands of a ruling council who were understandably very cautious. Licinius campaigned against them successfully and actually managed to bring the Lakhmids over to his side because no Persian aid came.
 
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