Final answer:
There is no historical evidence of Aristotle having a brother named Bernardo who was imprisoned, as Aristotle was a Greek philosopher with no records of such a sibling.
Step-by-step explanation:
The question is centered around the historical context of what actions or events might have led to Aristotle's brother, Bernardo, being imprisoned. However, based on the information and historical documentation available, there is no evidence or record of Aristotle having a brother named Bernardo who was imprisoned.
Aristotle was a classical Greek philosopher and there are no historical accounts that mention a sibling by that name involved in any notable legal troubles. The mentioned text refers to various historical individuals and situations, including Cassius Dio, a Roman statesman and historian, as well as mentions of Julius Caesar and Apuleius's Apology, but none of these relate to Aristotle or a brother named Bernardo. Therefore, it is not possible to provide a reason for the imprisonment of Aristotle's brother Bernardo as he appears to be a non-existent or incorrectly attributed person in history.