Great video! Good work with the time line and research. And I'm glad to see you explore this subject.
A thought on Socrates and Plato: While we only know Socrates through his student Plato's writings, and it's believed that this Platonic version of Socrates sometimes say and do things only to help drive home Plato's personal views rather than Socrates' own views, maybe at least sometimes Plato actually does allow the real Socrates to speak to us, which may at times be at odds with Plato's own views, such as his views on animals and vegetarianism.
In general, I think it would have been difficult to adhere to vegetarianism let alone veganism in those times, much more difficult than it is in our era of food abundance. Their knowledge of nutrition was presumably also fairly poor. Still, the ideal of non-violence towards animals was there with some of these pioneers.
What clouds their judgement is perhaps the natural desire to justify all their actions. We like to think we are always acting 100% in accordance with our ethical convictions, even when we are acting out of necessity rather than unconstrained free will. The ancients may not really have had the opportunity to be actual vegans - vegetarianism was perhaps as far as they could go due to practical constraints.
As for actual veganism, AFAIK it didn't really become a practise until around the time of the birth of the Vegan Society in 1944, and it developed from vegetarianism. Well, I suppose that's for your next video on this subject.
