User blog comment:ImperiexSeed/Strength-scale in Supernatural/@comment-4011543-20120419170306/@comment-3481504-20120420010118

I'll go on to say; the King of Hell were:

Lucifer, Azazel, and later Crowley. Lucifer was simply because he's the Devil and creator of demons. Azazel held the fort down for a point, and Crowley usurped the throne after Lucifer's imprisonment.

With that, the other positions were:

Lilith was a leader of many demons. Alastair served as Hell's grand torturer, being of high-tier.