He is said to have founded one of the assemblies, either that in Delphi or Thermopylae (accounts vary), and to have combined the two, increased the number of the members, and extended the privileges of the body.
We can only interpret this legend by the probable supposition, that the date of holding the same assembly at two different places, at different seasons of the year, marks the epoch of some important conjunction of various tribes, and, it may be, of deities hitherto distinct.

It might be an attempt to associate the Hellenes with the Pelasgi, in the early and unsettled power of the former race: and this supposition is rendered the more plausible by the evident union of the worship of the Dorian Apollo at Delphi with that of the Pelasgian Ceres at Thermopylae [81].

The constitution of the league was this-- each city belonging to an Amphictyonic state sent usually two deputies--the one called Pylagoras, the other Hieromnemon.

The functions of the two deputies seem to have differed, and those of the latter to have related more particularly to whatsoever appertained to religion.

On extraordinary occasions more than one pylagoras was deputed--Athens at one time sent no less than three.