I fought a war with the Mongolians, and captured most of their emipre when the Greeks attacked me, so I vasseled the Mongolians.
Many years later the Greeks invaded and captured one of the cities I had taken from the Mongolians. I immediately recaptured the city but it became Mongolian instead of mine.
Later another similar city was capured by the Greeks, but when I retook it it did return to my control, however the Greeks then recaptured it, and when I liberated it it became Mongolian instead of mine.
There had not been any votes on returning cities - the AP had only 2 members, and the UN had not been built.
Many years later the Greeks invaded and captured one of the cities I had taken from the Mongolians. I immediately recaptured the city but it became Mongolian instead of mine.
Later another similar city was capured by the Greeks, but when I retook it it did return to my control, however the Greeks then recaptured it, and when I liberated it it became Mongolian instead of mine.
There had not been any votes on returning cities - the AP had only 2 members, and the UN had not been built.