Which ancient civilization pioneered the use of royal seals as product endorsements, guaranteeing quality and authenticity for goods traded throughout the Mediterranean?

Before influencers and celebrity endorsements became the norm of modern marketing, ancient civilizations had their own sophisticated methods of product promotion. Royal families, religious figures, and military leaders often lent their names and images to goods to increase their perceived value and trustworthiness. This trivia question explores one of history's earliest and most influential product endorsement systems.

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Ancient Phoenicians, whose royal purple seal on textiles and wine amphorae indicated premium quality approved by the royal court
Ancient Egyptians, whose pharaonic cartouches were stamped on pottery and goods to indicate royal patronage
Ancient Romans, whose SPQR stamp on products signified official endorsement by the Senate and People of Rome
Ancient Greeks, whose Athenian owl symbol served as an official mark of quality for silver products and exported olive oil