Which ancient civilization first used royal seals as a form of brand endorsement on products, creating premium 'royal approved' goods that commanded higher prices in markets?

Before social media influencers and celebrity endorsements, ancient civilizations had their own ways of promoting products and building brand recognition. Royal figures, priests, and warriors often served as early forms of brand ambassadors, lending their authority and reputation to certain goods and craftspeople. This poll explores how ancient civilizations utilized influential individuals to boost sales and create product demand thousands of years ago.

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Ancient Egypt, where Pharaohs endorsed specific artisans with royal cartouches
Mesopotamia, where kings stamped clay tablets to authenticate merchant goods
Ancient Rome, where emperors granted special medallions to preferred suppliers
Ancient China, where the first emperor created imperial seals for preferred silk producers