Attributed arms are Western European coats of arms given retrospectively to persons real or fictitious who died before the start of the age of heraldry in the latter half of the 12th century. Arms were assigned to the knights of the Round Table, and then to biblical figures, to Roman and Greek heroes, and to kings and popes who had not historically borne arms (Pastoreau 1997a, 258). Each author could attribute different arms for the same person, but the arms for major figures soon became fixed.
Notable arms attributed to biblical figures include the arms of Jesus based on the instruments of the Passion, and the shield of the Trinity. Medieval literature attributed coats of arms to the Nine Worthies, including Alexander the Great, Julius Caesar, and King Arthur. Arms were given to many kings predating heraldry, including Edward the Confessor and William I of England. These attributed arms were sometimes used in practice as quarterings in the arms of their descendants.
Attributed or imaginary arms appeared in literature in the middle of the 12th century, particularly in Arthurian legends. During the generation following Chrétien de Troyes, about 40 of Arthur's knights had attributed coats of arms (Pastoreau 1997a, 259). A second stage of development occurred during the 14th and 15th centuries when Arthurian arms expanded to include as many as 200 attributed coats of arms.
During the same centuries, rolls of arms included invented arms for kings of foreign lands (Neubecker, 30). Around 1310, Jacques de Longuyon wrote the Voeux de Paon ("Vows of the Peacock"), which included a list of nine famous leaders. This list, divided into three groups of three, became known in art and literature as the Nine Worthies (Loomis 1938, 37). Each of the Nine Worthies were given a coat of arms. King David, for instance, was assigned a gold harp as a device (Neubecker, 172).