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The origin of heraldry is lost in the night of time, at the time when warriors protected themselves from evil and demonstrated their aggressiveness by decorating their shields with protective symbols and marks. Later, the true Heraldry emerged, at the time of the Crusades, in which knights wore their coats of arms as a means of identifying themselves in battle, later becoming emblems of nobility. Heraldry thus originated in circles of the highest nobility, later spreading to other layers of society. The award of the coat of arms was therefore made to a certain individual with the right to perpetuate it in his lineage. Who was the main ancestor and propagating trunk of this illustrious lineage is ignored for its remote antiquity, being traditional and immemorial the nobility of their children, who have always and everywhere enjoyed the consideration and pre-eminence corresponding to their lustrous births, not being the most enlightened of its lines the one that took root and flourished in Portugal. Based on studies of the origin of this surname, we can assure that it has suffered over the centuries dialectal variations or others such as contractions, diminutives, lenitives, errors due to bad transcriptions and pronunciation, using Fragoso, Fraguero and Fragueiro as oneself. With the reign of Don Joao III, Pedro Fragueiro, the son of Octaviano Fragueiro, Duke of Genoa, settled in Portugal, who for service to his country and his Sovereign Joao III, was awarded countless times. Another branch of this family settled in Spain, with records of it from the 11th to the 14th century, particularly in the battle of Uclés, where the infant D. Sancho son of Alfonso VI "El Batallador", King of Castile and León, was killed and Doña Zaida, daughter of Motamid de Sevilla. The references of this family seem to be needed