Christmas, which began to be celebrated in Rus' in the 10th century, has traditionally been a quiet and calm holiday. Christmas Eve - Christmas Eve - was celebrated modestly, but the next day fun and revelry began. They went from house to house with songs, arranged round dances and dances, dressed up as bears, pigs and various evil spirits, frightened children and girls and guessed. And, of course, they paid tribute to the "green serpent".