The Subjection of Women is an essay by English philosopher, political economist and civil servant John Stuart Mill published in 1869, with ideas he developed jointly with his wife Harriet Taylor Mill. Mill submitted the finished manuscript of their collaborative work On Liberty (1859) soon after her untimely death in late 1858, and then continued work on The Subjection of Women until its completion in 1861. At the time of its publication, the essay's argument for equality between the sexes was an affront to European conventional norms regarding the status of men and women. John Stuart Mill credited his wife, Harriet Taylor Mill, with co-writing the essay.[citation needed] While some scholars agreed by 2009 that John Stuart Mill was the sole author, it is also noted that some of the arguments are similar to Harriet Taylor Mill's essay The Enfranchisement of Women, which was published in 1851. Harriet Taylor Mill's daughter, Helen Taylor, is believed by some to have contributed to the essay as well