Eve of St. Martin (also known as Eve of Liège) ranks prominently among late medieval women whose piety helped to promote mainstream religious observances. With St. Juliana of Cornillon, she worked to establish the Feast of Corpus Christi, which was formally instituted in 1264 by Urban IV, and authored a French vita of Juliana. Though that work no longer survives, it served as the archetype for the Latin vita, which was composed anonymously, most likely during Urban’s pontificate.