The "Selenus" sets were typical of Germany and Northern Europe and named after Gustavus Selenus, the pen name of Augustus the Younger, Duke of Brunswick-Lüneburg, author of "Das Schach- oder Königsspiel" ("Chess or the King's Game"), an important chess manual published in the early 17th century (1616). The picture is of the engraving in that book showing chess pieces after which the "Selenus" type is named. This type was made during a long period and the form has been evolved, but for centuries pieces very similar as the ones in the book were made, as Scandinavian pieces show.