This is the 8002nd most frequent Russian word.
королевства
"Kingdoms" (plural form).
In this sentence, 'королевств' is used in a narrative context, referring to the subject of an account or tale.
История этих королевств была полна приключений и загадок.
The history of these kingdoms was full of adventures and mysteries.
'Королевства' is used in a reference to political entities within a delineated map region.
На карте были отмечены все королевства региона.
All the kingdoms of the region were marked on the map.
Here, 'королевствах' refers to geographical areas ruled by a monarch, emphasizing fantasy or historical context.