The Royal Bend of Castile (Banda Real de Castilla) was the heraldic flag of the monarchs of the Crown of Castile, a personal banner of military use, distinctive indicating to the troops the presence of the monarch and allowed them to have identified his position in the battles.
The dragantes appeared on the handpiece or baton when Scipio brought the Roman legions to Hispania.
Alfonso XI founded the Order of the Royal Band of Castile to reward the best services to the sovereign.
It consisted, from the reign of Henry IV of Castile, on a reddish flag, probably purple scarlet, with a golden bend of throaty dragantes heads of the same color.
Prior to the reign of Henry IV, the colors were something changing and have been preserved representations of the Royal Bend of Castile in the reign of Peter of Castile with dragantes of white and black color bend.