The grandaddy of all the current strategy games is the DOS based, text only, 100K size "Empire", circa 1982. You needed to have an ANSI driver loaded to position the text cursor properly. The keyboard placement of commands was a little unusual, and there were no sound effects.
Letters and puncutation represented the various units and terrain, e.g., oceans were periods (.). All maps were random, and there were no scenarios.
The enemy was lowercase, and you were uppercase.... only 2 sides to the war. You could not stack units, and there was no terrain types other than land and water.
The AI was pretty darned good, but then again the game was simple too.
Empire inspired the Civ I team.... all of Civ is based on an extension and vast improvement of Empire.
I have a copy of it somewhere, and even way back when, there was no restrictions on distributing it. I can find it if someone is really intersted... it was a great game, considering 256 K Ram, and 4.77 MHz PC's with Hercules graphics cards at best.
PS, The game may be a little complex for people today, LOL! Actaully, it had quite a list of rules and details to it.