The philosopher known for his contributions to ethics and government is Aristotle. A student of Plato, Aristotle made significant advancements in various fields, including philosophy, politics, biology, and ethics. His works, such as "Nicomachean Ethics," explore the concept of virtue and the moral character necessary for a good life, emphasizing virtue ethics as a foundation for ethical behavior. In politics, Aristotle's "Politics" examines different forms of government and advocates for the idea of a constitutional government as the most stable. His insights have profoundly influenced Western thought, providing frameworks for morality, governance, and human behavior that are still referenced today.