Which ancient civilization pioneered the use of 'product endorsements' through potter's marks that guaranteed quality and became so prestigious that other craftsmen began counterfeiting them?

Before billboards and social media influencers, ancient civilizations had their own sophisticated methods of product promotion and endorsements. Royal seals, celebrity craftsmen, and merchant marks were the original 'brand ambassadors' of the ancient world. This trivia explores how ancient civilizations used early forms of endorsements to promote products and build consumer trust in marketplaces from Rome to China.

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Ancient Greeks, whose Athenian potters signed their work to command premium prices in Mediterranean markets
Ancient Romans, who used gladiator endorsements on amphoras of wine and olive oil
Ancient Egyptians, who placed pharaonic seals on luxury goods to indicate royal approval
Ancient Chinese, who used imperial craftsmen's marks on silk and porcelain to verify authenticity