Tradition holds that Saint Nicholas (Sinterklaas) and his aides arrive each year by steam boat from Spain in mid November. Black Peter carries with him the book of Saint Nicholas. The rest of the entourage carries gifts, chocolate letters and spice nuts to be handed to the well-behaved children.
During the subsequent three weeks, Saint Nicholas is believed to ride a white-grey horse over the rooftops at night, delivering gifts through the chimney to the well-behaved children, while the naughty children risk being caught by Saint Nicholas's aides that carry jute bags and willow canes for that purpose