The Viking Age in two volumes as a broad study of the early history, manners, and customs of the ancestors of the English-speaking nations. He labored for eight and a half years and carefully read hundreds of Sagas that describe the life of the people who inhabited the Scandinavian Peninsula from the Stone Age to the Middle Ages (including literary remains). This scholarly work demonstrates what is now generally recognized, the importance of the Norse, including Norway, Sweden, and Denmark to the cultural dimension and transformation of British Isles during the fifth to eleventh centuries

Paul Belloni Du Chaillu (1831-1903) was a French-American traveler, zoologist, and anthropologist. He became famous in the 1860s as the first modern European outsider to confirm the existence of gorillas, and later the Pygmy people of central Africa. He later researched the prehistory of Scandinavia.