References in classic literature ?
Of the twelve prisoners who had been chained ahead of me each alternate one had been freed commencing with Dian.
Simon next walked up to the place where Emmeline was sitting, chained to another woman.
he said, giving a shove to the mulatto woman to whom Emmeline was chained, "don't you carry that sort of face
Armed guards and panting dogs watch intently over the chained men.
Thinking about humans chained together, I find it difficult not to connect it with slaves being sent to the market for sale.