Guerin, Garin, Warin, or Werner was the Count of Auvergne, Chalon, Mâcon, Autun, Arles and Duke of Provence, Burgundy, and Toulouse. Guerin established the region against the Saracens from a base of Marseille and fortified Chalon-sur-Saône (834). He took part in many campaigns during the civil wars that marked the reign of Louis the Pious (814–840) and after his death until the Treaty of Verdun (843). The primary sources for his life are charters and chronicles like the Vita Hludovici.