http://wiki.kingdoms.com/tiki-index.php
Each player starts the game as the leader of a small, undeveloped village, surrounded by undeveloped resource fields. Developing these fields increases their resource output.
The village can be developed by constructing new buildings and upgrading existing ones; with Travian: Kingdoms you can now also make your village to a City, which increases the population of the village and offers higher building and resource levels.
Training military units allows you to attack other villages or oases, plunder their resources, and defend from enemy attacks.
Villages may trade their resources with other villages if both villages have a marketplace. The higher the level of your marketplace, the more merchants you will have and the more resources you can transport.
You can choose to become King of your own kingdom, join another kingdom or to stay neutral. As neutral villages have no kingdom, they can be part of a foreign kingdom of another king. You expand your realm by founding new villages, or by conquering other players' villages.
You can communicate to other players by using the in-game chat, and may join alliances or secret societies for military and economic co-operation.