Tertullian

“ Those, therefore, whom they had provided for the combat, and then trained in arms as best they could, only that they might learn to die, they, on the funeral day, killed at the places of sepulture. They alleviated death by murders. ”

“ But by degrees their refinement came up to their cruelty; for these human wild beasts could not find pleasure exquisite enough, save in the spectacle of men torn to pieces by wild beasts. Offerings to propitiate the dead then were regarded as belonging to the class of funeral sacrifices; and these are idolatry: for idolatry, in fact, is a sort of homage to the departed; the one as well as the other is a service to dead men. Moreover, demons have abode in the images of the dead. ”