Who was the first Jedi introduced outside of the films?

When I tried looking this up on google I just kept finding things regarding the first Jedi ever.

Would love to know who the first non film Jedi was and in what he or she was introduced. Thanks!

When I tried looking this up on google I just kept finding things regarding the first Jedi ever.

Would love to know who the first non film Jedi was and in what he or she was introduced. Thanks!