We almost had one on EC back in... '07? Maybe late '06. There was a three-realm federation in the north, and they were all allied to a three-realm federation in the north. The only realms not in the federation were Perdan/Caligus/Ubent, all three together were smaller than Perdan is now, and Light of Fountain.
http://wiki.battlemaster.org/index.php/Image:EC_Feds.png
