The Ma'ase-Ester, "Esther's affairs", is a 14th-century Judeo-Provencal poem on the story of Esther, intended for a recital during the banquet for Purim. The short poem - recently discovered in the single manuscript that preserves it - is a new precious document that enriches a small corpus of medieval Judeo-Provencal texts. This book offers the first critical edition of the complete text accompanied by a detailed study of the sources and the language. It guides us in understanding why the story of Esther became such a popular theme in 14th-century Provence, and in what way the Avignon Papacy and the studies on Moses Maimonides influenced this literary novelty.