Which ancient civilization developed the first known branded retail products with maker's marks that functioned similarly to modern product endorsements?

The ancient world wasn't just about monuments and warfare—it was also home to sophisticated commercial systems. From the bustling agoras of Greece to the complex trade networks of Mesopotamia, ancient civilizations pioneered retail concepts we still use today. This trivia question explores how ancient merchants marketed their products and built their brands in an era before digital technology.

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Mesopotamian potters (c. 4000 BCE) who stamped distinctive seals on their pottery to indicate quality and origin
Egyptian merchants (c. 1500 BCE) who inscribed pharaoh names on luxury goods to increase their perceived value
Roman gladiatorial schools (c. 100 CE) that licensed their famous fighters' names for wine and oil products
Chinese Han Dynasty (c. 200 BCE) officials who created imperial seals for approved silk merchandise