Classical paganism had many illustrious vegetarians who were outspoken on the subject. Such figures as Ovid, Appolonius of Tyana, Plutarch, Plotinus, and Porphyry were all vegetarians who also identified themselves with classical paganism.
On Eating of Flesh is still quoted by vegetarians today. Porphyry, living several hundred years later, wrote the earliest surviving book- length treatment of vegetarianism, On Abstinence from Animal Food, where he forthrightly deals with the moral worth of animals, the natural repugnance of humans to animal flesh, and the effects of meat-eating on health.
Many modern neo-pagans are vegetarians as well, as is evident from looking at modern neo-pagan literature. They quote the Pagan Federation principles in support of their vegetarianism: "`Do what you will, but harm none.'