Secession of Provence
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When West Frankish Emperor Louis the Stammerer died, Provence seceded.
Chronology
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October 879: In April 879, Louis the Stammerer died, leaving two adult sons, Louis III of France and Carloman II. Boso joined with other western Frankish nobles and advocated making Louis III of France the sole heir of the western kingdom, but eventually both brothers were elected kings. Boso renounced allegiance to the brothers and in July claimed independence by claiming the title Dei gratia id quod sum: by the Grace of God, that is what I am. He also claimed that his imperial father-in-law had named him as his heir. On 15 October 879, the bishops and nobles of the region around the rivers Rhône and Saône assembled in the Synod of Mantaille. They elected Boso King and successor to Louis the Stammerer, the first non-Carolingian king in Western Europe in more than a century.
