Saint Nicholas was a 4th-century saint and Greek bishop in Myra (modern-day Turkey). Because of the many miracles attributed to his intercession, he is also known as Nikolaos the Wonderworker. He had a reputation for secret gift-giving, such as putting coins in the shoes of those who left them out for him, and thus became the model for Santa Claus (whose modern name comes from the Dutch Sinterklaas).
Note: Merry Christmas!