User blog comment:Vivaporius/AT Idea: Imperial Civil War/@comment-3341288-20120408193232/@comment-3258762-20120410183315

Last time i checked, neither the Emperor nor Sanguinius classified as Chapter Masters.

As, if you note what i said, was what i said logan was: the most loved chapter master in the imperium

As quoted on the Wiki: Logan Grimnar is a rarity amongst the Space Marine Chapter Masters, for he is more respected and loved by the commoners of the Imperium than he is feared, for he possesses an uncompromising compassion towards the weak that rivals that of the Emperor himself.

Link: http://warhammer40k.wikia.com/wiki/Logan_Grimnar