Please note the spelling. This site has many, many clever and bright bloggers, and the reaction to our first three mystery identities has been praiseworthy.
Quis One: Pablo Picasso, in a pic taken when the artist was well under twenty.
Quis Two: Prince Felix Youssoupoff, one of the two Russian aristos who assassinated Rasputin.
Quis Three: (good spelling is essential!) Nietzsche, philosopher and owner of one of the biggest moustaches on record.