Events in Styria do not come into the direct narrative in A Little Hatred. But it's mentioned that Monza has kept her grip on Talins and exerted power over all Styria to make her son, the King of Styria. Shenkt, Monza's protector, is setting up Styria as a third world power that is independent of Bayaz and Khalul.
Queen Terez, Jezal's wife, has pushed Jezal to fight Monza. Monza has defeated one (maybe two) Union invasions. Terez wants their son, Orso, to inherit both the Union and Styria to become Emperor.
Two points to remember... Terez is the daughter of Duke Orso of Talins who had almost become King of Styria. Prince Orso of the Union is named for his grandfather.
And... Monza's pregnancy resulted in a son, Rogont. Rogont is named for his father, King Rogont of Styria (for only five minutes). If you remember that chapter in Best Served Cold where Monza and Shivers are having intercourse (sexually and verbally) as the point of view shifts back and forth... until you realize they are not in the same room, then you'll remember that the paternity of Monza's son is unknown. I do not recall a physical description of Rogont.