Mikulás (or Szent Miklós) is the Hungarian version of Saint Nicholas, and a similar figure to Santa Claus. In many cities, Mikulas is getting more conflated with Santa Claus. Still, it is believed that Mikulas arrives to celebrate his day, December 6, and leaves before Christmas. This tradition is also well known in Romania (Moș Nicolae), Slovenia (Miklavž), the Czech Republic, Slovakia (both Mikuláš),Croatia (Sv. Nikola) and Poland (Mikołaj). Wikipedia