Ruben Oskar Auervaara
Ruben Oskar Auervaara (until 1935 Jansson, from 1952 to 1959 Risto Oskari Karnas, from 1959 Erik Kristian Jansson, born 4 September 1906 – died 26 May 1964) was a notorious Finnish conman and thief. He became famous by cheating money from women he met through newspaper announcements, by pretending to intend to marry them.