Aristotle.

Aristotle was born in 384 BC in the town of Stagira, state of Macedonia, in northern Greece. His father was a physician. He was a gifted student and therefore was sent to Athens to study in the Academy of Plato. He remained there for some twenty years until Plato died. In 342, he returned home and was employed by King Phillip of Macedonia as the private tutor for his 13-year-old son, later to be known as Alexander …

…anyone who had been friendly with Alexander. They indicted Aristotle for "impiety:" claiming that he had offended the Gods-- the term was roughly synonymous with treason. Given a choice between trial, certain death, and exile, he chose the latter. He left Athens, recalling the death of Socrates some 76 years before, saying he was not going to give Athens a second chance to sin against philosophy. He died shortly thereafter in 322 BC at the age of 62.