Roman Theatre and Museum of Orange: The Roman theatre at Orange was built according to traditional theatre design : tiered seats, an orchestra, stage and stage wall.  

The tiered seats arranged in a semi-circle, known as a “cavea,” can accommodate up to 10,000 spectators.

The audience occupied particular areas of seating in strict accordance with their rank and status. 
At the front and nearer the stage, were important people in both civic and military life. At the back and further away, were people from humbler backgrounds. The social hierarchy of the city was therefore perfectly reflected in the theatre..

The front seats were reserved for the upper class of society. Here is a remaining etched marking EQ GIII, seats reserved for a class of military elite.

The area way above the tiered seats was called the “pullus,” the latin word for “chicken” (and most probably the origin of the french word “poulailler” — chicken coop). This area was reserved for slaves, labourers, and prostitutes. — some information from the audio guide at the theatre