Which ancient civilization pioneered the concept of 'royal warrants' - official endorsements where craftsmen could advertise that they supplied goods to the royal household?

Before celebrity endorsements and influencer marketing, ancient civilizations had their own methods of promoting products and services. Royal seals, divine associations, and prestigious connections were used to increase value and trustworthiness of goods. This poll explores one of history's earliest examples of what we might call 'brand ambassadors' - individuals whose identity or reputation was deliberately connected to products to enhance their appeal.

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Ancient Egypt, where pharaohs granted special seals to their preferred artisans around 3000 BCE
Ancient Rome, where the 'Annona' system marked officially approved grain suppliers
Ancient Persia, where the Achaemenid kings awarded 'royal purveyor' status to elite merchants
Ancient China, where the Han Dynasty emperors created the first formal system of imperial product endorsements around 200 BCE