Rules may need to be interpreted situationally (damn you autocorrect, this is spelled correctly and so is autocorrect!), but the best resource of listed rules is:
http://wiki.battlemaster.org/wiki/Rules_and_PoliciesRegarding Sironite secessions, I know I'm asking for the moon here, but wouldn't it be awesome if Sirion starting getting away secessions/new realms/cities like Oprah? And you get Krimml! And you get Oligarch! And you get Avamar! And you get Parm! Cities for everyone!