The Houses are families of usually blood-related Colors, though some exceptional lancers or Colors are able to be adopted or marry into the family. They are referred to as gentes in ancient Roman fashion, so far, no stirpes have been observed. Not to be confused with the various genera of Society, more common known as Colors. They also sometimes display limited variation on names, as Darrow was considered uncommon, and House Bellona had a Julius, Julia, and Julian.
The families are believed to be the true powers of the Society, below the Sovereign. Each has there own armies and fleets, which contribute to the Sovereign's forces. Each House is greatly loyal to their own and often compete with other Houses for power and standing.