User blog comment:Princepurple/Seven sins and knights/@comment-5619706-20140123160634

Pride is the root of all sin, so I've heard and read so I think he was the leader of the seven.

As for the Knights, I suppose we will never know because once again the writers blew their chance in explaining hierarchy and even mentioning at least one or two other names of the knights. Was it really difficult to insert a line, like, "I killed them all. Asmodeus. Mammon. Beelzebub. Except for one." Hell, they did it with the angels (Azrael, Sophia, etc.) who died from the fall.

Sticking to this show post-Kripke era is suffering.