#4 Hardcore Championship (1998 - 2002)
The Hardcore Championship was introduced in WWE on November 2, 1998, when Vince McMahon awarded the title to Mankind aka Mick Foley.
The title saw a 24/7 defense rule and saw the late Crash Holly became champion with 150 title changes in the six months before its discontinuation. Like the European Championship, the Hardcore title was also unified with the Intercontinental Championship on August 26, 2002. Rob Van Dam was again the last Hardcore Champion after he defeated Tommy Dreamer.
A similar title was introduced on May 20, 2019, in an episode of Monday Night RAW called the 24/7 Championship with the same rules as the Hardcore title of a 24/7 defense. In the Universe Era, which began in 2008, the word "hardcore" couldn't be said on live television, which was the reason to reintroduce the new name.
#3 WWE Divas Championship (2008 - 2016)
Then Smackdown General Manager Vickie Guerrero introduced Divas Championship as an alternate to RAW's WWE Women's Championship on July 20, 2008.
Michelle McCool became the inaugural champion when she beat Natalya at The Great American Bash 2008. The title continued until 2016, when WWE decided to call its female wrestlers 'superstars' instead of 'Divas.'
Hence it was only logical to discontinue the Divas Championship, replaced by the RAW Women's Championship. WWE Hall of Famer Lita revealed the new title at WrestleMania 32.