Cinna the poet is confused for Cinna the conspirator when he arrives late for the funeral of Julius Caesar. He is still killed by the people even after they discover he is not the conspirator. This can symbolize the chaos that ensued after the assassination of Caesar. It also shows us the love and dedication the people had for Caesar that they would attempt to avenge his murder. Linked to the photo is an article for further reading.
This is a video focusing on some of the most important traditions and ceberations in Ancient Rome. In Julius Caesar, Caesar and others return from "the games" in Act 1 Scene 2. They are returning from from Ludi (public games held at religious festivals) during the time of Lupercalia, a festival promoting health and fertility.
Because the Romans didn't believe life was a gift from the gods, the concept of suicide was not as morally egregious as other societies.
Aristotle condemned suicide because it robbed the community of the services of one of its members. In accordance with this, Ancient Rome was very practical in its perception of suicide. For example, it was forbidden for those accused of capital crimes, soldiers and slaves to commit suicide because it was uneconomic for them to die.
In Ancient Rome, it was common for suicide to occur after a defeat in battle to avoid enslavement from the opposing side. Brutus, Cato, and Cassius, for example, killed themselves after the defeat at the battle of Philippi.
A very definite line was drawn by the Romans between the virtuous suicide and suicide for entirely private reasons.