Which saint inspired the figure of Santa Claus?

Saint Nicholas

What river of forgetfulness flowed in the Underworld? Who cursed a fig tree causing it to wither immediately in the New Testament? Name the psychological thriller directed by Christopher Nolan starring Leonardo DiCaprio set within multiple dreams? Which insect produces a buzzing sound by rapidly beating its wings up to 1,000 times per second? In what building would you find the 'Hall of Mirrors'?