In Tybalt's case, it means bloody control of the local Court of Cats. He became their king by right of blood; he's held the position by beating the crap out of anyone who tries to take it away. The Cait Sidhe take a more direct and bloody approach to succession than most of Faerie.
Seanan McGuire, Rosemary and Rue
cat-king, cats, faerie, king, succession