James Williams, Encyclopædia Britannica, Ninth Edition (1888)
“ The rules as to the torture of slaves were numerous and precise. It was a maxim of Roman law that torture of slaves was the most efficacious means of obtaining truth. [30] They could be tortured either as accused or as witnesses, but against their masters only in accusations of treason, adultery, frauds on the revenue, coining, and similar offences (which were regarded as a species of treason) , attempts by a husband or wife on the life of the other, and in cases where a master had bought a slave for the special reason that he should not give evidence against him. ”
