Shall We Play A Game?

Every decade the rules changed.

The powerful became the powerless.
The weak became the strong.
Anyone could win it, as long as they followed the rules:

1) You cannot kill innocents
2) You must represent a High House
3) Romance is always an option
4) Kills must be made by the participants
5) Poisons are prohibited
6) Kills must be made within the Castle and Tournament grounds

The breakage of any rule will result in immediate abdication.
Eliminations are final and favours must be won.

Win the game.
Good luck.