Julius Caesar played a role in the decline of the republic in that he caused a great rift between political leaders, but played a role in the rise in that he greatly inspired the people.
The decline of agricultural economies
Alexander the Great destroyed the city of Thebes because he wanted to send a message to the other Greeks that were thinking of revolting like Thebes did. Thebes and other Greek city-states had a pact with Phillip II, Alexander's father, king of Macedonia, that they would be a part of Macedonia. When Phillip died and Alexander took over Macedonia, the Greeks did not want to bow to a 'child' (a 20 year old). Also it had been rumored in the cities that Alexander was dead and it was the perfect time to revolt. That is the reason Alexander the Great destroyed the city of Thebes.
The Code of Chivalry is usually what a knight lives by, like his code of self honor, respect, worth, loyalty, and brotherhood. Im not sure this helps Im sorry