Quick Summary
You start with several knights and castles on the board. Define your domains by playing boundary walls that extend out and around your castles. Once your castles are encircled, you can score victory points for towns, forests, and mines within their territory. Play cards from your hand to place boundaries, recruit knights, increase your domain at the expense of a neighbor who has fewer knights, forge peace treaties with troublesome neighbors, and stealing opponents' knights. Each card offers one or two actions, which you must pay to initiate.
Gradually you will see your domaine form and then expand, bringing it into conflict with the domaines of others. The presence of knights within each domaine will determine how vulnerable it is to expansion. Kluas Tueber is one of the premiere game designers.
For more information, click on the Funagain link or review the description for Domaine at the Boardgame Geek.