Who discovered existentialism?

Related questions

1. What is the main idea of existentialism?
2. What is Sartre's existentialism?
3. What is the goal of existentialism?
4. What is the difference between existentialism and essentialism?
5. What is an existentialist hero?
6. What is the difference between essentialism and existentialism?
7. What is essentialism philosophy?
8. What is an example of existentialism?
9. What are six common themes found in existentialism?
10. What does existential really mean?

Tags

1. #fundamental
2. #movement
3. #existentialist
4. #considered
5. #unclear
6. #kierkegaard
7. #supported
8. #whether
9. #nietzsche
10. #would
11. #friedrich
12. #neither
13. #existentialism
14. #century
15. #first
16. #philosophers
17. #though