I think it was in The Shadow Rising. mcskim 46 quoted a passage about Moiraine telling the girls that she knew who she'd marry. Also, Chapter 17, Deceptions, has a lovely flirtatious scene between the pair. I *think* Moiraine had already fallen for Thom, but I don't think he could admit to...
I want to credit GM Damodred with saying somewhere in here that the "Broken Crown" of Saldea refers to the primogeniture succession (birthright) of the ruling family. Since Tenobia is "unhitched", then other family would have to step up should she be unable to reign.
So, how lovely a couple...