The Kingdom of the West is a kingdom of wolves who live together in peace, after their former leader, Vadar, united the packs who used to live in the kingdom's area before.
They are first spoke of by Yin-Yang in episode 8, when telling her pups a story. She is told to say they were lead by Vadar, and then by Rune, after murdering Vadar and his family. Yin-Yang first speaks of them saying way back when she was a pup, they found peace in a wolf named Vadar. He was the alpha of a single pack, but other packs were drawn to him.
Afterwards, she discusses Vadar baring pups, Balder, Kahleel, and Apollo. When he had pups, Balder became next-in-line to having the position of king. After meeting with a loner named Mink, he bore pups and cut off comminucation with the kindom entirely. He had two daughters, Tia and Aurora, and one son, Erol. It is also said that he gave birth to, or adopted Lupis.
After Balder left, Kahleel became king, due to Vadar growing old. Apollo disagreed and gathered a following, alligning himself with Rune. Soon enough, tragic struck and Rune betrayed Apollo, lying to him that he and Apollo wished to speak to Kahleel, but instead killed Vadar, Apollo and Kahleel.
Later, he found Balder and explained to him he was the last member of 'The Royal Family'. He gathered some of his strongest wolves, and attacked Balder, killing him. He then gave Mink the final choice of coming with him to rule the kingdom, but she refused. He then killed her and her pups, leaving the Royal Family desceased. But to Rune's surprise, he had no idea of Lupis being the final son of Balder.