Karen Blixen and Julian Barnes both used pseudonyms in their works.
Karen Blixen Baroness Karen Christenze von Blixen-Finecke (née Dinesen; 17 April 1885 – 7 September 1962) was a Danish author who wrote works in Danish and English. She is best known under her pen names Isak Dinesen, used in English-speaking countries, and Tania Blixen, used in German-speaking countries. She also published works using the aliases Osceola and Pierre Andrézel.
A History of the World in 10½ Chapters A History of the World in 10½ Chapters is a novel by Julian Barnes published in 1989. It is a collection of short stories in different styles; however, at some points they echo each other and have subtle connection points. Most are fictional but some are historical.