Which ancient civilization first used cylinder seals as a form of 'brand identity' for merchants, allowing them to mark their goods with distinctive impressions in clay?

Before modern logos and trademarks, ancient civilizations had their own sophisticated systems for marking products and establishing merchant identities. Artisans and traders from Egypt to Mesopotamia developed unique symbols and seals to distinguish their goods and build reputation. This poll explores how ancient societies approached what we now call 'brand identity' - the visual and conceptual elements that differentiated one merchant's products from another's.

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Mesopotamia (ancient Sumer)
Ancient Egypt
Indus Valley Civilization
Ancient China