You mentioned Olympics but you missed out on the original Olympics which were very much all about that international (sort of as they were city-states) competit

You mentioned Olympics but you missed out on the original Olympics which were very much all about that international (sort of as they were city-states) competition with a truce set up to allow for a relatively safe event. https://en.wikipedia.org/wiki/Ancient_Olympic_Games https://en.wikipedia.org/wiki/Ancient_Olympic_Games