Outlaw Status and Excommunication
The king (and only the king) has the power to outlaw any of his nobles. The Active Players list in the Herald menu shows the nationality of all players. Note that in France there are players who own French fiefs but are not French. This is common in the border areas with Italy and Germany. An outlawed noble has his stature reduced and his fiefs are more prone to rebel (because their Fief Loyalty is reduced). An outlawed noble can be executed by another noble with out the executing noble losing stature for it.
An outlawed character cannot ransom if captured and held by a character of the same nationality. The emperor can outlaw any of the Other players to prevent these players, if captured by an Other, to ransom. The character is considered outlaw the moment the sysop updates the player to outlaw status.
The sysop enforces this until it is incorporated in the code.
The pope can excommunicate a player. This is essentially the same effect as being outlawed, except for the ransom angle. Excommunicated players can still ransom..