Lecture by Adam Lazebnik: "Rome — The Empire: From Rise to Sunset"

At our previous meeting (link), we ended the story with the assassination of Gaius Julius Caesar.
What did this murder mean? What new forms of political power emerged after Caesar?
How did Caesar’s heirs manage to concentrate absolute power in their hands while still calling it a republic?
How did the emperors rule, and how did imperial authority evolve over time?