Lord Parkin
aka emperor
Since it only happens when you raze a city and not when you capture one though, it could be seen as a bit unbalanced...I won't say I like this random event, but I look upon it as part of the price you may pay for fighting a war. Frankly, in Civ II this used to happen almost every time you captured a city in the late game, so I'm kind of used to it. Just bring along a few more defensive and counter-attacking units and you'll be fine.