Given the title, one would assume that there are kings as main characters. There might be a character, perhaps a woman, who has these 'flings' with the kings. There could also be advisors or courtiers who play roles in either facilitating or trying to prevent these relationships that lead to 'royal ruin'. Without more context or having read the novel, it's hard to be certain about the main characters.
How did the 19 monsters in the PlayStation 4 Digimon Online Detective, the Royal Knight and the Seven Demon Kings, evolve? He begged the Almighty for help.
The Royal Knight and the Seven Demon Kings were the two villains in the Digimon Internet Detective. According to the information I know, the Royal Knights evolved from the " Demonic Beasts " and the Seven Demon Kings evolved from the " Dark Beasts ". Other than that, I can't provide any more information for the time being. If you have any other questions, feel free to ask.
There's no way to know exactly who the two kings are without more context. They could be fictional characters created for the story, or they could be based on historical kings from different regions.
There were several different actors who played the role of the Eldest Princess's palace maid. Among them, the Eldest Princess was played by Li Xiaoran. However, there was no relevant information in the search results provided, so it was impossible to determine who was playing the palace maid.
The 3 Wise Kings were probably astrologers or scholars from the East. Their names are often given as Melchior, Caspar, and Balthazar, though there are different versions in different traditions.