This is the 3926th most frequent Polish word.
sobieskiego
"Sobieskiego" is a form of "Sobieski," a Polish surname, often referring to King John III Sobieski. It is the genitive singular form used in contexts like addresses or possessives.
Sobieskiego is used here as a possessive form, indicating the palace associated with Sobieski, referencing a historical figure.
Przejeżdżaliśmy obok pałacu Sobieskiego w Warszawie.
We were passing by the Sobieski palace in Warsaw.
Sobieskiego identifies the family name of the king in the statement discussing historical context.
Jan Sobieskiego był królem Polski w XVII wieku.
John Sobieski was the king of Poland in the 17th century.
Sobieskiego refers to the individual Sobieski as the subject of the book in a question form.