30.November 1858 - 19. January 1938
was an Austrian freethinker, author, painter, musician and feminist. She was the daughter of Franz Arnold Obermayer, a wealthy restaurant operator and barkeeper, and his second wife Marie.
Rosa had 12 brothers and sisters and although her conservative father did not believe in the formal education of girls he allowed her to participate in the Greek and Latin lessons of one of her brothers. She also received private instruction in French, painting and the piano.