The Schliemann's Defence or Schliemann–Jaenisch Gambit refers to the moves 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5.
f5 is of course a gambit move by black typically known as the Jaenisch Gambit when white plays the Ruy Lopez scenario. Questions is: Who was Schliemann? Is the name referring to a person or is this some creative term?