Buddhist society was quite non-violent. So were the Jains in India. (Unsure why I am being downvoted though). Both were based on strictly following Ahimsa https://en.wikipedia.org/wiki/Ahimsa
I'm so glad you bring this up. Folks in the west just assume that large scale non violent societies are not possible. They're definitely possible and are inevitably ruined decades or centuries later by warlike invaders.
Jainism in particular should be given a massive shout-out for being the largest and oldest organized genuine religion of non violence. These are the people who are unhappy about washing dishes as killing the bacteria left of the plate is "kitchen violence".
At the risk of calling for a no-true-Scotsman response, I do not know very much about Jainism, but a quick perusal does not leave me with the impression that its adherents are much less violent when they are in charge.
"His expansion of the kingdom, especially his annexation of the kingdom of Anga to the east, is considered to have laid the foundations for the later expansion of the Mauryan Empire." (https://en.wikipedia.org/wiki/Bimbisara)
"He forcefully took over the kingdom of Magadha from his father and imprisoned him. He fought a war against the Vajjika League, led by the Licchavis, and conquered the republic of Vaishali." (https://en.wikipedia.org/wiki/Ajatashatru)
