 Mill idolized Harriet, and credited her with virtual co-authorship of many of his works. Untangling the influence she exerted upon Mill’s thought is complicated, precisely because the two worked so closely together on what would become many of Mill’s central ideas. She died, however, in 1858, while Mill and she were travelling through France. Harriet was buried in Avignon, where Mill subsequently purchased a house close by the cemetery, and lived for the rest of his life. Mill inscribed on her grave that 