Galen (Galēnos, 129–c. 200 CE) was primarily a medical author, but had a deep engagement with and influence on the philosophical debates of his time. He wrote many works of logic and ethics, and also addressed those and other philosophical areas—especially of epistemology, causation in the natural world, and philosophy of mind—in his medical-scientific writings. His medical, and in some contexts his philosophical, work had enormous influence throughout the medieval period and even later, both in Europe and (through Arabo-Islamic transmission) beyond. Largely ignored by the intellectual world, including philosophers, since the Scientific Revolution, he has recently attracted considerable scholarly attention, especially for his work on scientific knowledge, his contribution to logic, and his discussions of ethics, moral psychology and the mind–body relationship.