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Regan was the author of numerous books on the philosophy of animal rights, including The Case for Animal Rights (1983), one of a handful of studies that have significantly influenced the modern animal rights movement. In these, he argued that non-human animals are what he called the “subjects-of-a-life,” just as

Pythagoras of Samos was an ancient Ionian Greek philosopher, polymath, and the eponymous founder of Pythagoreanism. Until the word vegetarianism was coined in the 1840s, vegetarians were referred to in English as “Pythagoreans.”