Treason (3.5e Skill Use)
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The best way to avoid committing an act of treason is to be familiar with local politics. At least then, if you commit treason it will be because you’re choosing to do so. Any of the following skill or ability checks should help in this regard: Bardic Lore (DC 23), Knowledge (history) (DC 22), Knowledge (local) (DC 12), Knowledge (nobility) DC (17), or Knowledge (religion) (DC 17). History, nobility, and religion will only provide you with information about treason relating to that subject; for example, Knowledge (religion) will tell you what would be considered an act of treason against the church.