Regnos possessed what can be described as a caste system. Each person was placed in one of six castes based on their birth, and although it was possible to move from one caste to another, it was both difficult and rare. Caste was an important factor in Regnosian society, and there was little mixing between people of significantly different caste. The caste system paid considerable attention to one's status with regards to a noble house (see Politics) — those who had sworn service to a house ranked above those who had not, even if they did the same jobs and had the same standard of life.