Finally! This took forever :\ I've been trying to keep my own kingdom together for about 2 months now, running all over the place fighting off the neighbouring nations because no lord wants to join me. This guy was one of the old Swadian Counts who joined the Vaegirs when Swadia was wiped from the map. Luckily for me the Vaegir nation suffered some serious defeats, so there were no fiefs to go round for the new nobles like Devlian. So him and two other similar nobles I could identify as possible candidates for my nation. Problem is they needed to be convinced, but I focused my attributes and skills into fighting instead of diplomacy. Hence I had to steadily level this guy, Lezalit, to become my main diplomatic emissary. Even so, I think this is about the seventh time I've tried to convert Devlian. I even sent him wine and ale to sweeten the deal, and even once delivered one of his personal letters to another noble! Hope the guy is worth it.
Now let's see if I can get a few other lords on board as well. I want to wipe the damn Kerghits from the map so that I don't ever have to deal with a horse archer army ever again!