Answer: Shakespeare could have used the information about his personality, political influence, and tyranny.
When Shakespeare wrote his play The Tragedy of Julius Caesar, he based his character on accounts of the past, such as the ones mentioned in the passage. Caesar is one of the most important figures of world history, and therefore, the information on his life is abundant. Out of the information mentioned in the passage, Shakespeare could have used the information about Caesar's personality, political influence, and tyranny in order to create a more believable, complex Caesar.