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The Holy Roman Emperor, Lothair I, composed two letters to Pope Nicolaus I, and his successor, Pope Adrian II, regarding the nature of his rule over the Frankish realm, and the relationship that his administration would have with the Papal Curia. There is some debate regarding the nature of episcopal appointments in these letters, an issue which would be a continual point of conflict until the last days of the empire.
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The Fourth Council of Constantinople is the eighth ecumenical council of the Catholic Church, held in the city of Constantinople from 869 to 870. The council was called by Emperor Basil I the Macedonian, with the support of Pope Hadrian II. It deposed and anathemized Photius, a layman who had been appointed as Patriarch of Constantinople, and reinstated his predecessor Ignatius. The Council also reaffirmed the decisions of the Second Council of Nicaea...
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The Synod of Ingelheim was called by Otto I the Great, in the then church of Saint Remigius in the German city of Ingelheim. Being summoned at the behest of Pope Agapetus II. It's primary goal was to resolve a long running Schism concerning the archiepiscopal see of Reims, then under the jurisdiction of the German Emperor. The synod was presided by Marinus of Bomarzo, then the Roman Church's primary librarian.