This is the 4043rd most frequent Polish word.
zamoyskiego
"Zamoyskiego" is the genitive singular form of "Zamoyski," a proper noun referring to the surname of a Polish noble family or individual.
'zamoyskiego' is used here as a genitive singular form, indicating possession or authorship of the book.
W książce zamoyskiego opisano ważne wydarzenia historyczne.
In Zamoyski's book, important historical events are described.
'zamoyskiego' is used as an adjective here, modifying 'człowieka' to signify a connection or description.
Spotkałem człowieka zamoyskiego w muzeum.
I met Zamoyski's man in the museum.
'zamoyskiego' again is in the genitive case, indicating the works attributed to or belonging to Zamoyski.