question: Who was Napoleon 's illegitimate son by his mistress , Maria Walewska ?
answer: Alexandre Colonna-Walewski
turker_answer: Napoleon 's illegitimate son by his mistress , Maria Walewska , was Alexandre Colonna-Walewski .
rule-based: Alexandre Colonna-Walewski was Napoleon 's illegitimate son by his mistress , Maria Walewska .