Its a pure poltical marriage announcement and a cheap attempt to try to draw some reaction from the audience. Apparently, she needs to be married to a noble family in order to take the throne or something, cuz that's the only way this would make any sense at all. They meet for like 5 minutes. Then again, the whole episode made zero sense and she's also in love with Inaho even though they didn't really even interact all that much either. I'm all for Slaine and Inaho being NTRed by Klancain though, that would be awesome.