I'm not entirely sure how best to introduce Yanin yet, but I feel like I've gotten a bit allergic to planning ahead too much. Seeing as it's not one of my characters (most of which are strewn across Reniam to be randomly encountered) I'd rather his encounter either be "immediately, wherever and with whoever it would make the most sense" or "whenever convenient".
As for where he could have come from, I wonder which kind of title his family has, if any? Rodorian nobles are either simply nobles, barons or counts (or dukes, but there can only ever be nine of those). The title will typically be indicative of how large/numerous their fiefs are and how much power they hold compared to other nobles. They'd probably fit in somewhat believably pretty much anywhere in almost any duchy (the only areas I've currently assigned as noble holdings are a bit of the northern coast in Wenal and the area immediately east of (and overlapping with) Zerul City), but would likely fit in best in Etlon, Seclyr, Nemhim, Wenal or Gilmah.
I also wonder what kind of knighthood Yanin belongs to... specifically whether its a local or international order.

Eh... and yeah, go ahead with Aemoten, I guess. Still don't know what to do about them.