I have come to the conclusion that the Hesse-Cassels are the most neglected dynasty in modern royal historiography, probably because their country disappeared from the map before the Great Royal Cull of WW1. They get so little attention, but had such a great influence of the extremely influential Glücksborgs. Considering that it was Christian IX and Louise's great grandfather Landgrave Friedrich II who sold the Hessians so famous in American folklore to the British, I'm surprised that there aren't more American royalty watchers fascinated by the Hesse-Cassels. Even more so considering how the Brothers Grimm and the Rotchschilds also are an essential part of their story. The story of Hesse-Cassel is simply such an Ur-German story.
Interesting Hessian titbit: The estate of Panker in Holstein, today the residence of the Landgrave of Hesse, was inherited by Christian IX's grandfather Carl of Hesse from his cousin, Fredrik of Hesse, King of Sweden's bastard son, the Prince of Hessenstein.