Emperor Charles the Fat is deposed by the Frankish magnates in an assembly at Frankfurt, leading his nephew, Arnulf of Carinthia, to declare himself king of the East Frankish Kingdom in late November.

Charles the Fat was the emperor of the Carolingian Empire from 881 to 887. A member of the Carolingian dynasty, Charles was the youngest son of Louis the German and Hemma, and a great-grandson of Charlemagne. He was the last Carolingian emperor of legitimate birth and the last to rule a united kingdom of the Franks.

A magnate is a man from the higher nobility, a man who belongs to the high office-holders, or a man in a high social position, by birth, wealth or other qualities in Western Christian countries since the medieval period. It also includes the members of the higher clergy, such as bishops, archbishops and cardinals. In reference to the medieval, the term is often used to distinguish higher territorial landowners and warlords, such as counts, earls, dukes, and territorial-princes from the baronage. In Poland the szlachta (nobles) constituted one of the largest proportions of the population and 'magnat' refers to the richest nobles, or nobles of the nobility - even though they had equal voting rights in Poland's electoral monarchy.

Frankfurt am Main is the most populous city in the German state of Hesse. Its 773,068 inhabitants as of 2022 make it the fifth-most populous city in Germany. Located in the foreland of the Taunus on its namesake Main, it forms a continuous conurbation with Offenbach am Main; its urban area has a population of over 2.7 million. The city is the heart of the larger Rhine-Main metropolitan region, which has a population of more than 5.8 million and is Germany's second-largest metropolitan region after the Rhine-Ruhr region and the fourth largest metropolitan region by GDP in the European Union (EU). Frankfurt is one of the de facto four main capitals of the European Union, as it is home to the European Central Bank, one of the institutional seats of the European Union, while Frankfurt's central business district lies about 90 km (56 mi) northwest of the geographic center of the EU at Gadheim in Lower Franconia. Like France and Franconia, the city is named after the Franks. Frankfurt is the largest city in the Rhenish Franconian dialect area.