champs by linear descent

After MARCIANO retired
PATTERSON beat MOORE to become the youngest ever undisputed heavyweight champ (a distinction he still holds, TYSON was not the youngest undisputed champ)
PATERSON lost and won against INGEMAR JOHANSON
LISTON beat PATTERSON
CLAY (ALI) beat LISTON
FRAZIER beat ALI
FOREMAN beat FRAZIER
ALI beat FOREMAN
LEON SPINKS won and lost against ALI
HOLMES beat ALI
MICHAEL SPINKS beat HOLMES
MIKE TYSON beat MICHAEL SPINKS
DOUGLAS beat TYSON
HOLYFIELD beat DOUGLAS
BOWE won and lost against HOLYFIELD
MOORER beat HOLYFIELD
FOREMAN beat MOORER
BRIGGS beat FOREMAN
LEWIS beat BRIGGS
RAHMAN won and lost to LEWIS
LEWIS retired as LINEAR champ.

until the four titles are unified (and they cant be till the WBA get rid of the F****** super champ belt) LEWIS still remains the LINEAR heavyweight champion of the world.