Well, "KHI Fables" took place in the kingdom of Arnaud Dragonsbane. Though he was lauded by all as a hero, he didn't actually slay a dragon. He won his kingdom through treachery and cowardice, put the dragon to sleep, and preserved his hero myth by appropriating the power of past kingdoms.
"The Last Queen" takes place in one such kingdom, I suppose. I based it on the (hastily written) "Tale of the Black Knight," which introduced the very same Black Knight of our current RP. Logically, his TLQ iteration is younger than his "Fables" self?but the wicked king of TLQ's history could have been a descendent of Dragonsbane.
Reading "KHI Fables" probably won't yield much useful material (though it is a fun read), but you might find it helpful to read the audition stories in the sign-up thread. They provide some loose context for goings-on, and show off a few familiar faces.