Which ancient civilization pioneered the practice of using royal seals as product endorsements, essentially creating one of history's first formalized brand ambassador systems?

Before modern celebrity endorsements, ancient civilizations had their own version of brand ambassadors. Royal figures, priests, and notable citizens would lend their names and reputations to endorse specific artisans, merchants, or products. These early endorsements played a crucial role in establishing trust and driving commerce in ancient marketplaces. Test your knowledge about how ancient civilizations approached what we now call 'influencer marketing' with this challenging question!

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Ancient Egypt, where pharaohs authorized special marks on goods they favored, creating an early certification system for quality products
Mesopotamia, where Sumerian kings granted 'royal warrants' to trusted merchants, allowing them to stamp clay tablets with the royal seal as endorsement
Ancient Greece, where Olympic victors would endorse pottery and wine amphoras with their names, creating prestige products for wealthy citizens
The Roman Empire, where Caesar's image on products served as imperial approval, guaranteeing quality and authenticity throughout the empire