Among historically famous people of Western Civilization which one is most lately born who has no known likeness?
By "historically famous" I mean some person who is mentioned as being historically significant in an English-language history textbook used widely in American or British secondary schools.
If there is some question as to whether a person is "famous" then apply the criteria that they must merit their own entry in the 1911 edition of the Encyclopedia Britannica and be a historically significant actor. By an "actor" I mean someone famous for their own actions on history, thus people like Robert Jenkins do not count because he became famous as an accidental victim, and actors and writers do not count because they are famous for their works, not their historical actions.
For example, there is Christopher Columbus, born in 1451, for whom there is no known authentic likeness.