 Anne Conway is known to be the author of a single treatise of philosophy. This was written at the end of her life and published anonymously in Amsterdam in 1690 in a Latin translation with the title, Principia philosophiae antiquissimae et recentissimae. It was translated back into English and printed in London in 1692 as The Principles of the Most Ancient and Modern Philosophy. The other source for her philosophical activities is her correspondence with Henry More.