Which ancient civilization first used standardized royal seals on products to guarantee their quality, creating one of the earliest forms of 'brand certification' in retail?

Before modern corporate logos, ancient civilizations had their own distinctive methods of brand recognition in marketplaces. From maker's marks on pottery to symbols on merchant stalls, these early branding techniques helped consumers identify trusted products and sellers in bustling ancient markets. Test your knowledge about how ancient merchants differentiated their products and built customer loyalty through early 'corporate identities' that pre-dated today's sophisticated logo designs by thousands of years.

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Ancient Egypt (with the cartouche of the Pharaoh)
Mesopotamia (with cylinder seals of Ur)
Ancient Greece (with the Athenian owl mark)
Indus Valley Civilization (with the square merchant seals)