10 Commandments of the SCA

1. Treat your inferiors in rank, knowledge, or experience in the society as if they were your equals; treat your equals as if they were your superiors; treat officers as representatives of Their Majesties; and treat the King and Queen with the reverence due your sovereigns.
2. Use medieval forms of address.
3. Be faithful to your lord and your word.
4. Gentlemen, honour all ladies.
5. Ladies, be worthy of that honour.
6. Touch no man’s goods unasked; give and receive with grace.
7. Be gentle to the stranger.
8. Raise your sword, not your voice.
9. Let the slain man tell if he be slain.
10. Reverence the King and Queen.

For an in-depth explanation of these commandments, see 10 Commandments of the SCA (PDF)