amphictyony: n. an association of neighboring states in ancient Greece to defend a common religious center
broadly : an association of neighboring states for their common interest
I ran across amphictyony in Paul Johnson’s book Heroes, a fascinating read with short profiles of heroic figures starting with ancient cultures.
Merriam-Webster. (n.d.). Amphictyony. In Merriam-Webster.com dictionary. Retrieved May 8, 2020, from https://www.merriam-webster.com/dictionary/amphictyony