The bend sinister, reduced in size to that of a bendlet (narrow) or baton (ending short of the edge of the shield), was one of the commonest brisures (differences) added to the arms of illegitimate offspring of European aristocratic lords.
[9] It also appears in the arms of Antoine de Bourgogne, illegitimate son of Philip the Good, Duke of Burgundy.
[10] These markings were never subject to strict rules,[11] and the customary English use of the bend, bendlet, and baton sinister to denote illegitimacy in this way eventually gave way to the use of different kinds of bordures.
[12] Sir Walter Scott is credited with inventing the phrase bar sinister, which has become a metonymic term for bastardy.
[13] Heraldry scholar Arthur Charles Fox-Davies and others state that the phrase derives from a misspelling of barre, the French term for bend sinister.