Can't leave out the influence Akira Kurosawa's The Hidden Fortress had on Lucas while creating Star Wars.
http://www.imdb.com/title/tt0051808/
Akira Kurosawa also directed another movie called Seven Samurai,
http://www.imdb.com/title/tt0047478/
which then gave us The Magnificent Seven.
http://www.imdb.com/title/tt0054047/
Akira Kurosawa, one of the greatest filmmakers off all-time.