[Avodah] [Areivim] Polygamy

[Moshe Y. Gluck]

R' Joel Rich:
> Seems logical but is there any discussion of how and who to make such a
> determination - especially since it seems assumedly chazal made these
> based on their corner of the world and on anecdotal evidence  (e.g. how
> did Sanhedrin determine whether rov hatzibbur would accept a gzeirah?)

I thought that that was after the fact. I believe an example of this is,
IIRC, Tevillas Ezra.

KT,
MYG