I am fine if anyone want put Brock as Nivemus Ruler since he was Ruler from Garas General time until he founded First Oligarch, even now he still the Ruler.
That's not entirely true. Brock did not become Ruler untill after Duchiess of Southern Sirion (later renamed First Oligarch) was founded. It was only a while after the founding that the wedding between Catherine and Garas was announced which led to Brock's rulership (was General before).
