Justus Lipsius (Joest Lips or Joost Lips; 18 October 1547 – 23 March 1606) was a Flemish Catholic philologist, philosopher, and humanist. Lipsius wrote a series of works designed to revive ancient Stoicism in a form that would be compatible with Christianity. The most famous of these is De Constantia (On Constancy). His form of Stoicism influenced a number of contemporary thinkers, creating the intellectual movement of Neostoicism. He taught at the universities in Jena, Leiden, and Leuven.