Slave collar

A slave collar is a collar used to identify and discipline slaves.¹

Slave collars have been attested to in 4th and 5th-century ancient Rome,² the antebellum United States,¹ and in serf populations in Scotland.³

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  Zoninus collar, Roman slave collar dating to the 4th–5th century AD
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  Roman collared slaves
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  Scottish serf's collar 1701
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  Black boy with slave collar, 17th century
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  Slave collar, 18th century
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  Neck restraint
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  Slave collar on Wilson Chinn, United States, 1863