Denmark is the southern-most Nordic country and the Kingdom of Denmark includes Denmark, the Faroe Islands, and Greenland. Denmark -- and the Scandinavian region around it -- was the source of the Vikings from the 8th through 10th centuries, and the unified Kingdom emerged in the 10th century.
The World Happiness Report frequently ranks Denmark as the happiest country on earth. This is attributed to the fact that the people and the government really care a lot about education and health care. Also, they have very low income inequality.
Denmark on Wikipedia