The Battle of Ctesiphon in 165 AD was part of the wider Roman-Parthian War.
The Parthians had tried but failed to take Armenia in the previous years, but a Roman counter-attack saw them lay a successful siege and capture of Ctesiphon.
In the end, the Parthians managed to re-group.
However, the Parthians were becoming steadily weaker, with more concessions given to the Roman Empire and the Parthian nobles and vassal kingdoms.
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