In that year, his first cousin once removed, Ermengard of Provence, daughter of the Emperor Louis II and wife of Boso of Provence, brought her son Louis the Blind to him for protection. Charles confirmed Louis in Provence (he may even have adopted him) and allowed them to live at his court. He probably intended to make Louis heir to the whole realm and the "imperium". On 11 November, he called an assembly to Frankfurt. While there he received news that an ambitious nephew, Arnulf of Carinthia, had fomented a general rebellion and was marching into Germany with an army of Bavarians and Slavs. The next week saw the collapse of all his support in East Francia. The last to abandon him were his loyal Alemanni, though the men of Lotharingia never seem to have formally accepted his deposition. By 17 November, Charles was out of power, though the exact course of events is unknown. Aside from rebuking his faithlessness, he did little to prevent Arnulf's move—he had recently been ill again—but assured that Bernard was entrusted to his care and possibly Louis too. He asked for a few estates in Swabia on which to live out his days and thus received Naudingen (Donaueschingen). There he died six weeks later, on 13 January 888.