What is a possessive proper noun?

A possessive noun is a noun that shows that something in the sentence belongs to that noun.

A proper noun is the name of a person, a place, a thing, or a title. A possessive proper noun is a proper noun that shows that something in the sentence belongs to it. For example:

Proper noun: Abraham Lincoln, Proper Possessive noun: Abraham Lincoln's portrait.

Proper noun: Chicago, Proper Possessive noun: Chicago's skyline.

Proper noun: The Statue of Liberty, Proper Possessive noun: The Statue of Liberty's color.

Proper noun: 'War and Peace', Proper Possessive noun: 'War and Peace's' author Leo Tolstoy.