Although it lacks the depth of a really great turned-based strategy, Defender of the Crown is very easy to learn and pretty fun.
I found this one while searching through lists of Commercial games turned freeware on wikipedia, and was pleasantly surprised with a very accessible game in the normally difficult to enter genre of turn-based strategies. You start the game by choosing one of four knights to be, each one with varying levels of skill in leadership, jousting, and swordplay. I'm unsure how exactly these affect gameplay, but I'm sure it's there somewhere.
Each turn you can do one action. You can hire soldiers like footmen, knights, and catapults, capture territories by sending your army out, build castles to defend captured territories, hold a knight's tournament to compete for fame or land, or raid an enemy's castle. Combat is very simplistic. Your numbers and the enemy's are displayed, but everything is calculated for you. You can choose how your force attacks (Stand and fight, aggressive attack, outflank, retreat, etc...), but honestly, I couldn't tell much of a difference in the outcome. Even when I had 30 men and they had 5, I still seemed to lose 4-6 men no matter the type of attack. When holding a tournament, you have to joust your opponent, where you have barely 2 seconds to aim your lance and hopefully make a hit, or else the tournament is over right away.
That's pretty much the extent of the game. Collect taxes. Make army. Capture all the territories on the map. No pesky micromanagement, training, or resource gathering. Nonetheless, a single game can go by so quickly, it's actually pretty fun and gets exciting when you are able to capture a sizable chunk of the map. Enjoy!
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