Who played Vito Corleone in 'The Godfather' (1972)?

Who directed 'The Good, the Bad and the Ugly' (1966)? Who directed 'Rocky' (1976)? Who directed 'Toy Story' (1995)? Who directed 'The Revenant' (2015), which earned Leonardo DiCaprio his first Oscar? Who played Michael Corleone in 'The Godfather' films? Who played the young Vito Corleone in 'The Godfather Part II'? Who played Travis Bickle in 'Taxi Driver'? Who played Hannibal Lecter in 'The Silence of the Lambs'?