 While her correspondence with Descartes comprises the only substantive extant philosophical writings of Elisabeth of which we are currently aware, we do know of other correspondence: with John Pell, concerning Descartes’s Geometry; exchanges with Quakers, including Robert Barclay, George Keith, and William Penn; and letters written both by and to her concerning political and financial matters in the English Calendar of State Papers. There is also record of a brief exchange with Nicholas Malebranche. She is also known to have been connected to Francis Mercury van Helmont, who is reported to have been at her deathbed. Ebbersmeyer (2020) provides the first inventory of the extant correspondence of Elisabeth, which includes not only the correspondence of which we were already aware and letters to family, but also letters with intellectuals associated with her stay in Heidelberg, where her elder brother Charles Louis was rebuilding the University after the Thirty Years War, including correspondence in which she circulated Descartes’ mathematical letters to her. The correspondence with Descartes reveals her to have been involved with an appointment in mathematics to the University of Leiden, contemporary discussions of astronomy (Ebbersmeyer 2018), the dissemination of Cartesian natural philosophy in Germany (Shapiro 2019), as well as in negotiations on a number of matters, including the imprisonment of her brother Rupert in conjunction with his efforts around the English Civil War, negotiations of the marriage of her sister Henrietta, negotiations of the Treaty of Westphalia, and the finances of her family after the end of the Thirty Years War.