Which ancient civilization invented the first known form of retail 'brand identity' by requiring merchants to stamp their unique seals on products as quality guarantees?

Before digital storefronts and modern retail experiences, ancient civilizations had sophisticated marketplace systems with their own unique approaches to customer experience and brand identity. The bustling agoras of Greece, Roman forums, Egyptian bazaars, and Mesopotamian markets all featured distinct methods for merchants to distinguish themselves and attract customers. Test your knowledge about how ancient merchants built their 'brands' and marketed their products thousands of years ago!

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Mesopotamia (specifically Babylonians)
Ancient Egypt
Classical Greece
Han Dynasty China