This is the 11888th most frequent Polish word.
królewskiej
"Royal" (possessive or descriptive form related to a king or royalty).
Here, 'królewskiej' is an adjective that describes the noun 'rezydencji', denoting that the residence is royal.
Mieszkałem w królewskiej rezydencji podczas podróży.
I stayed in the royal residence during my journey.
In this sentence, 'królewskiej' serves as an adjective modifying 'uczty', expressing that the feast was royal.
Smak królewskiej uczty był niezapomniany.
The taste of the royal feast was unforgettable.
In this usage, 'królewskiej' is an adjective that qualifies 'historii', indicating its relation to royalty.