Which ancient civilization's merchants used cylinder seals as an early form of 'corporate logo' to mark their products and authenticate trade documents?

Before modern logos became ubiquitous, ancient civilizations developed their own distinctive symbols to represent their products, rulers, and empires. These ancient 'corporate logos' served many of the same functions as today's brand identities - establishing authority, communicating values, and distinguishing goods in marketplaces. This trivia question explores how ancient civilizations used visual identity in ways that parallel modern branding practices.

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Mesopotamia (Sumerians)
Ancient Egypt
Indus Valley Civilization
Minoan Crete