::::::::::: Not necessarily, a kingdom can also be, for example, a vassal of another kingdom. Look at the Habsburg Kingdom of Croatia, it was definitely not in a personal union with the Habsburg Monarchy. Or the Kingdom of Croatia-Slavonia, it was officialy "Politički narod sa zasebnim teritorijem", as specified in the Croatian-Hungarian settlement. If renaming this article to Kingdom of Croatia would endorse the personal union, then a merge with the KoC (925-1102) would do the same. Its not that I'm totally against such a move, the Kingdom of Hungary (although they have special articles for various periods of it) and Kingdom of Bohemia did the same thing, but all the way to 1918. However, Kingdom of Poland has only separate articles. Bulgaria has two articles about the Bulgarian Empire, and one stub article about both of them.