Handbook Major Periphery States was a pretty big let down if you were looking for info on the Reunification War. The original Periphery book still has the most info, including detailing some of the turning points for the Magistracy and the Star League forces. The info in Handbook MPS was pretty generic. (I have to admit, considering the book was supposed to be about the major, current Periphery states, I would've liked to have seen alot more details about the fighting in the current periphery states, both during the Reunification War and the Periphery Uprising that lead to the Amaris coup, instead of all the details on the RWR side of things..that really belongs in a Historical product. Sure, some is necessary, but I would've rather seen a shifted focus).
As for nobility, the best I can find right now is in the "Other Notable Personalities" section of Masters and Minions (in the MoC writeup, naturally) that states that Kamala Roy was given the title "Durachi Roy of Joyz." So its possible that the 3 ranks (Froness, Girin, Durachi) might be the only ranks.