Which preposition to use with amphictyons

of Occurrences 1%

The war will no doubt commence in Belgium, and of course the Emperor Napoleon will be the assailant, for it cannot be supposed that after the act of ban passed against him by the Amphictyons of Vienna he will remain tranquil, and not strike the first blow, which may render him master of Belgium and its resources.

Which preposition to use with  amphictyons