The Collaborative International Dictionary of English v.0.48:

Amphictyons \Am*phic"ty*ons\, n. pl. [L. Amphictyones, Gr. ?.
   Prob. the word was orig. ? dwellers around, neighbors.]
   (Grecian Hist.)
   Deputies from the confederated states of ancient Greece to a
   congress or council. They considered both political and
   religious matters.
   [1913 Webster]