3950 B.C.
If you don’t know about Civilization 2 but are interested in finding out a little more I would recommend this Wikipedia article.
I first played Civ2 around about 1997. My friend had a copy and I used to love to go round and play two player games long into the night on his PC. It was just so insanely addictive. You could always find a reason for one more turn! At one point I had a copy for the Playstation 1 and I developed a seriously unhealthy addiction to the game when I probably should have been studying for collage. Over the years life moved on and I forgot about Civ2. Then about 5 or 6 years ago I got a new PC (my first one) and soon found a copy of Civ2. The wife and child probably didn’t see me of several weeks as I gazed at the monitor, totally absorbed in my little Civ2 worlds.
Then I got an internet connection and whilst browsing I stumbled across a website called Civilization Fanatics Center and its huge database of Civ2 scenarios created by fans. These covered everything from Ancient Egypt to the Cold War and even Science Fiction. I had months of fun trawling through hundreds of scenarios, uncovering some real gems in the process. This led me to create my own scenario about World War 2 in Europe. I had mostly created it for my own enjoyment as I thought, erroneously, that the Civ2 scene was dead and there would be nobody out there still playing to try my work. How wrong I was!