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In page Pawnbroker:

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Most European towns called the pawn shop the "Lombard".[citation needed] The Lombards were a banking community in medieval London, England. According to legend, a Medici employed by Charlemagne slew a giant using three bags of rocks. The three-ball symbol became the family crest. Since the Medicis were so successful in the financial, banking, and moneylending industries, other families also adopted the symbol. Throughout the Middle Ages, coats of arms bore three balls, orbs, plates, discs, coins and more as symbols of monetary success.