Which ancient civilization pioneered the practice of 'Royal Seals' as product endorsements, where artisans could place a royal symbol on their goods after receiving official approval for quality?

Before modern celebrity endorsements, ancient civilizations had their own sophisticated methods of product promotion. Royal and religious endorsements carried tremendous weight in ancient markets. Merchants would pay handsomely for the right to claim their goods were used by pharaohs, emperors, or high priests. This poll explores how ancient civilizations utilized early forms of product endorsements to influence consumer behavior in marketplaces that thrived thousands of years ago.

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Ancient Egypt, where pharaohs granted 'Seals of the Double Crown' to exceptional craftsmen
Mesopotamia, where Babylonian kings issued 'Royal Stamps' for products meeting strict quality standards
Ancient Greece, where products could bear the 'Mark of Athens' if approved by city officials
Roman Empire, where the 'Imperial Eagle' symbol could be used on goods personally approved by the emperor