Historical clue formulations

• 1950s heavyweight Johansson — 2018-05-11
• ___ Johansson, 1959-60 world heavyweight champion — 2014-05-18
• Former world heavyweight champion Johansson — 2012-05-16
• Former heavyweight champion Johansson — 2009-06-02
• 1959-60 heavyweight champion Johansson — 2003-05-10