Colosseum In Seven Wonders of the World 2007,Rome, Italy

 According to the Codex-Calendar of 354, the Colosseum could accommodate 87,000 people, although modern estimates put the figure at around 50,000. They were seated in a tiered arrangement that reflected the rigidly stratified nature of Roman society. Special boxes were provided at the north and south ends respectively for the Emperor and the Vestal Virgins, providing the best views of the arena. Flanking them at the same level was a broad platform or podium for the senatorial class, who were allowed to bring their own chairs. The names of some 5th century senators can still be seen carved into the stonework, presumably reserving areas for their use.

Side view of Colosseum seating

The tier above the senators, known as the maenianum primum, was occupied by the non-senatorial noble class or knights . The next level up, the maenianum secundum, was originally reserved for ordinary Roman citizens  and was divided into two sections. The lower part  was for wealthy citizens, while the upper part  was for poor citizens. Specific sectors were provided for other social groups: for instance, boys with their tutors, soldiers on leave, foreign dignitaries, scribes, heralds, priests and so on. Stone  seating was provided for the citizens and nobles, who presumably would have brought their own cushions with them. Inscriptions identified the areas reserved for specific groups.
Another level, the maenianum secundum in legneis, was added at the very top of the building during the reign of Domitian. This comprised a gallery for the common poor, slaves and women. It would have been either standing room only, or would have had very steep wooden benches. Some groups were banned altogether from the Colosseum, notably gravediggers, actors and former gladiators.
Each tier was divided into sections by curved passages and low walls, and were subdivided into cunei, or wedges, by the steps and aisles from the vomitoria. Each row  of seats was numbered, permitting each individual seat to be exactly designated by its gradus, cuneus, and number.

Colosseum In Seven Wonders of the World 2007,Rome, Italy