This is the 6929th most frequent Polish word.
glinskiego
"Glińskiego" is the genitive form of the Polish surname "Gliński," often meaning "of Gliński" or "belonging to Gliński."
Here, 'Glinski' is used as a proper noun, referring to someone's surname, and 'glinskiego' is the possessive case indicating that the book belongs to Glinski.
Czy przeczytałeś książkę Glinskiego?
Have you read Glinski's book?
Here, 'Glinski' is used to denote a title or position associated with a person named Glinski, and 'glinskiego' is in the accusative case, indicating reception of action.
Uczestniczyłem w wykładzie prowadzonym przez profesora Glinskiego.
I attended a lecture conducted by professor Glinski.
In this sentence, 'Glinski' refers to a person, and 'glinskiego' is in the instrumental case, denoting involvement or interaction with him.