This is the 9708th most frequent Polish word.
zamkowemu
"Zamkowemu" means "to the castle" or "relating to the castle" in the dative case.
Here, 'zamkowemu' serves as a dative case adjective referring to a masculine noun, 'strażnik' (guard), meaning 'related to the castle'.
Przekazałem klucz zamkowemu strażnikowi.
I handed the key to the castle's guard.
In this sentence, 'zamkowemu' is used in the dative case to describe 'przewodnik' (guide), indicating the guide associated with the castle.
Zapytaliśmy zamkowemu przewodnikowi o historię budowli.
We inquired the castle guide about the history of the building.
The word 'zamkowemu' modifies 'zarządca' (administrator) in the dative case, indicating the relation to the castle.