The Shang dynasty almost lasted 600 years there was a total of 30 emperors. this was the first family of the rulers who left the written history behind, Anyang was one of the capitals of Shang dynasty that was the oldest and one of the important Shang cities.
Higher classes in the Shang dynasty lived in the wood houses with walls of clay while peasants lived in the hovels outside the city, the dynasty was divided between nobles and the peasants.
Because once an indentured servants time is up, you have to let them live their own life, but if you have a slave, you literally own them and keep them until they die if you choose to do so.
While including the typical barons and knights, Simon de Montfort had also included burgesses (originally a freeman of a borough) from influential towns.
