Definitions of historical:

• adjective:   having once lived or existed or taken place in the real world as distinct from being legendary

  Example: "The historical Jesus"

• adjective:   of or relating to the study of history

  Example: "Historical scholars"

• adjective:   belonging to the past; of what is important or famous in the past

  Example: "Historical (or historic) times"

• adjective:   used of the study of a phenomenon (especially language) as it changes through time