Keys to becoming a Civ II Deity (I know you asked for Emperor, but I can’t resist :p):
1: Starting position.
This is absolutely non-negotiable. You must be able to build your first city within 3 turns, and it has to be on a very good spot, three special resources minimum, and absolutely no deserts, mountains, or what not. Save your game if you have to so you can explore a little and reload, and don’t be afraid to restart as necessary.
2: Exploration and Expansion
Never stop exploring and expanding. Save before entering villages so you can get the villager unit and build a city nearby. Again, always look for special resources, but be careful how you space out your cities, and don’t build one that is too far for you to defend. You must take complete control of the continent you’re on, and at worst, face only a few enemies through narrow land bridges. Coastlines are infinitely easier to defend, and no one can bother you until they’ve built up sufficient land and naval forces. Destroy any attempt to settle your continent at all costs.
3: Wonders
Face the facts: you will not be able to get every wonder there is. Go for a wonder that brings benefits to all your cities, like the Hanging Gardens.
4: Fortification
Once you get control of a continent, you must fortify. Start building roads to facilitate the movement of your military. You will be outnumbered, so you have to be able to utilize a large proportion of your units than your opponents. Don’t bother with walls and what not because they are not cost efficient; stick with your units. Use terrain to your advantage; send villagers to modify the terrain at key choke points. Keep fortifying as time goes on. Modify the terrain, build roads in every square and irrigate everything within your sight.
5: Science
Always stay ahead of your opponents in technology. Sacrifice a bit of your military early on so you can at least keep up with the computer. Go for technologies that give you good defensive military units first. Don’t try to research all the technologies though, that’s what spies are for.
6: Trade
This is the single factor that distinguishes the masters from the amateurs. Trading is almost abusive in Civ II, so use it to your advantage. Start trading as soon as possible, and do it en mass. This is when the benefits of expansion and road building come into play. Devote as many cities as you can to caravan production. Remember the special ability of caravans; you can send them to help the construction of wonders in other cities. The only way you’re going to get any wonders in the mid-late stages of the game is through massive deployment of caravans.
7: Espionage
All your computer opponents cheat, so try to make them fight amongst themselves and nullify their advantage. Steal technologies, incite riots and wars, and sabotage if you have extra spies. Don’t worry about diplomacy; they’re all hostile anyway. Make sure there is always a war going on between your opponents (preferably involving the strongest one). Whenever they have time to develop in peace, you’ll lose.
8: Making War
War is tough on this level. If you have to, always attack the weakest opponent or gang up on the strongest one. You must be an opportunist. Attack an opponent while he’s under pressure, and make peace once you get what you want. If you ever have the luck of annihilating an opponent, make sure you keep one of their cities in place so you can rip them clean of all their technology, either though espionage, trade, or threats.
As always, don’t forget to save frequently. You’re going to make mistakes the first time through, so don’t be afraid to reload and learn…