In heraldry, gules (//) is the tincture with the colour red, and belongs to the class of dark tinctures called "colours". In engraving, it is sometimes depicted as a region of vertical lines or else marked with gu. as an abbreviation.
In Polish heraldry, gules is the most common tincture of the field. Through the sixteenth century, nearly half of all noble coats of arms in Poland had a field gules with one or more argent charges on them.
The original coat of arms of the d'Albret family was plain gules.
The gules tincture is said to represent the following:
The term "gules" derives from the Old French word goules, literally meaning "throats" (related to the English gullet; modern French gueules), but also used to refer to a fur neckpiece, usually made of red fur.
For many decades, heraldic authors have believed that the term may have arisen from the Persian word gol "rose" (coming to Europe via Muslim Spain or brought back by returning Crusaders), but according to Brault there is no evidence to support this derivation.
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