If put short, the Common Law decrees that the commoners trust and obey the nobles, and the nobles treat the commoners with the same trust, protecting them. These edicts slowly resulted in a total symbiosis. It is commonly agreed that should the bonds break, the situation could be called a small-scale doomsday.
Tchum-sah-ree with a very short m, and the a like in the British path. (I have this mental image of Sevroa pronouncing it Ktchummshaareyh, but he bludgeons Daren as it is...)
Addendum: /tʃʉmsʌɦri:/ (I'm going to have to come back to this once I've studied this properly, but this appears to be the correct way.)