Which sentence from The princess and the tin box contain proper noun?

In "The Princess and the Tin Box," several sentences contain proper nouns. Here's an example of a sentence with proper nouns:

Sentence with proper nouns: "Princess Sophia, along with her trusty companion Sir Nathaniel, embarked on a daring adventure to retrieve the magnificent Tin Box, which was rumored to hold magical secrets guarded by the wise dragon, Draco the Magnificent."