Click Kingmaker description wikipedia
"The game is set in the time of the English Wars of the Roses (1455–1487). Two to seven can play. Each player builds and controls a faction of nobles that, through battle, diplomacy and politics, attempts to eliminate other player's factions, and gain control of one or more members of the two rival royal families, the House of Lancaster and the House of York."
"The real contest is often a contest of diplomacy. One strong player can be brought down by any number of weaker players working together, and threats, promises and agreements can be easier ways to get the desired results than by using brute force. Players can trade many types of cards, and agree on future spoils of war or honours awarded. However, no agreement made in the game is binding; supposed allies can change sides at will. The winner is often the player who manages to double-cross the other players just before they double-cross him."