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A knight is a member of the Order of Chivalry who has sworn fealty to the Crown.
Definition - https://www.sca.org/resources/document-library/govdocs/ (Oct 2019)
4.a. The Chivalry:
- (i) The Chivalry consists of two equal parts: Knighthood and Mastery of Arms. No one may belong to both parts of the order at one time. When a member is admitted to the Chivalry by the Sovereign, the choice of which part of the order to join is made by the new member. The candidate must be considered the equal of his or her prospective peers with the basic weapons of tournament combat. To become a Knight, the candidate must swear fealty to the Crown of his or her kingdom during the knighting ceremony. Masters of Arms may choose to swear fealty, but are not required to do so.
- (ii) The duties of the Chivalry are as follows
*(a) To set an example of courtesy and chivalrous conduct on and off the field of honor. *(b) To respect the Crown of the kingdom; to support and uphold the laws of the kingdom and Corpora. *(c) To enrich the kingdom by sharing his or her knowledge and skills. *(d) To support and uphold the Crown of his or her kingdom. *(e) To enhance the renown and defend the honor of the peer’s Lady or Lord. *(f) To advise the Crown on the advancement of candidates for the Chivalry. *(g) To bestow the Accolade of Knighthood upon a candidate for the Order of Knighthood, by sole right as both Sovereign and knight, or acting directly for a Sovereign who is not a knight.