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Rh and exposure. In many cases, as a measure of precaution, the slaves were forced to work in chains, and to sleep in subterranean prisons. Their bitter hatred towards their masters, engendered by harsh treatment, is witnessed by the well-known proverb, "As many enemies as slaves," and by the servile revolts and wars of the republican period. But from the first century of the empire there is observable a growing sentiment of humanity towards the bondsman. Imperial edicts take away from the master the right to kill his slave, or to sell him to the trader in gladiators, or even to treat him with any undue severity. This marks the beginning of a slow reform which in the course of ten or twelve centuries resulted in the complete abolition of slavery in Christian Europe.