Have there been other instances before or parallel to Christianity where war, revenge and conflict was repudiated or not seen as an ideal - and instead peace and love for the others (love for the neighbor) was one of the core ideals?
closed as off-topic by American Luke, Pieter Geerkens, Kobunite, jwenting, Mark C. Wallace May 19 at 11:10
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Buddhism predates Christianity and some believe some of the ideas of Buddhism traveled along the Silk Road and reached the Middle East. They may have influenced thought in that area in the years before the appearance of Christianity.
Buddhism, although some would argue it’s not a religion, does promote peaceful co-existence. The five precepts are:
Wikipedia has an article on Buddhist influences on Christianity.
Without going into details, however, I believe there are arguments against the perception of Christianity as entirely peaceful and repudiating things like revenge (eternal punishment in Hell for starters).