You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Napoleon

Context:
Napoleon acknowledged one illegitimate son: Charles Léon (1806–1881) by Eléonore Denuelle de La Plaigne. Alexandre Colonna-Walewski (1810–1868), the son of his mistress Maria Walewska, although acknowledged by Walewska's husband, was also widely known to be his child, and the DNA of his direct male descendant has been used to help confirm Napoleon's Y-chromosome haplotype. He may have had further unacknowledged illegitimate offspring as well, such as Eugen Megerle von Mühlfeld by Emilie Victoria Kraus and Hélène Napoleone Bonaparte (1816–1907) by Albine de Montholon.

Question:
Who was the mother of Charles Léon?

Eléonore Denuelle de La Plaigne