A sovereign domain within the Sanctuary — one repo, one house, one set of laws under the family's shared sky. The realms are how the whole stays many.
Old French reaume, variant of reialme, from Vulgar Latin regalimen, from Latin regalis (royal), from rex (king); a realm was first the reach of one ruler's authority, and the sense of a bounded, self-governing territory follows directly.
A sovereign domain within the house — one repo, one set of laws, under the family's shared sky. The root's kingship is fitting even without a king: a realm is still defined by whose law holds inside its own edge.