Yule Cat

An Icelandic mythological character, a monstrous black cat the size of a bull, living in the mountains of Iceland. 

The story of a scary black cat living in the mountains was first recorded in the XIX century. He enters villages and wanders at night during Yule (Yuletide), attacking and eating those who did not get some woolen new clothes for Christmas (according to a later version, he steals only festive treats).