system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Who is the true ruler of Hell?

The show Lucifer tells us that he is the ruler of hell.

Then, in DC Legends of Tomorrow and Constantine, Satan/ First of the Fallen, Belial, and Beelzebub show up, ruling hell.

Can anyone give an explanation over the hierarchy of Hell in DC universe? Tv Shows, movies, even comic book answers are accepted.

Also, what connection does Neil Gaiman's Sandman have to Lucifer?
gpt
The version of Hell that exists in mainstream DC universe has no true ruler - there are multitude of various archdevils that keep their own domains and there's one singular empty throne, which noone dares to take, despite it being empty for aeons. Largely due to the obvious fact that once someone tries, literally everyone in Hell would unite against him. 

In Vertigo, Hell naturally has a ruler - that be Lucifer, and once Lucifer decided to fuck off, God (or The Presence) promptly told two other angels, Dante and some other guy to keep shit in Hell in check. Ironically, once angels decided to try and redeem the damned souls by moralizing to them endlessly, Hell became even more insufferable than it used to be.