Saint Nicholas

Short definition from Wiktionary

Proper noun

1. 1
   A 4th-century Greek bishop from Myra, Anatolia, patron saint of children, mariners and the unwed among others, functioning in multiple countries as a gift-giving figure around his feast day of December 6.
2. 2
   Santa Claus; a figure derived from traditions surrounding the historical Saint Nicholas who is said to bring Christmas presents to children on Christmas Day.