was granted governorship over eastern marches. Carloman's letter to his father from 869 survives, describing conditions on the frontier. In 870, he succeeded in establishing Frankish domination over Great Moravia, through arrangement with Svatopluk, who captured his uncle Rastislav of Moravia, ruling prince of Moravia, and gave him over to Carloman. During the following Frankish invasion, Moravian archbishop Methodius was also captured and sent to Carloman. In 871, he managed to capture Svatopluk, thus establishing direct control over the entire principality, but soon decided to reinstall him, in order to pacify the country. That proved to be disastrous, since Svatopluk, as soon as reaching Moravia, turned against Carloman, inflicting severe losses on Frankish army. In 873, after several interventions of Pope John VIII, including those made to Carloman, a peace settlement was reached in Forchheim, between king Louis and envoys of Svatopluk, thus concluding the state of war on eastern borders. Division of Frankfurt In order to prevent future dynastic conflicts, king Louis decided to regulate the position of his three sons within the government. In 865, an arrangement on the future succession was reached and promulgated in Frankfurt, thus becoming known as the Division of Frankfurt. Bavaria and southeastern marches were designated to Carloman, Saxony and Franconia to Louis the Younger, and Alamannia to Charles the Fat. Princes were to become rulers of designated domains only upon their father's death. None of them was given the title of a king during his father's lifetime, but their position within the state affairs was regulated in detail, with king Louis keeping all of the main prerogatives of royal power. At the same time, all of king's sons married into the local aristocracy of the regions marked out for them. Carloman married the daughter of a Bavarian military leader (dux) named Ernest, whom the Annales Bertiniani describe as "the greatest of all the king's great men". This marriage must have taken place before Ernest's disgrace and dismissal in 861, for Louis the German strongly disapproved of his second son's seeking a marriage with family that had likewise been disgraced in 858–59. By the 870s, according to the Annales Bertiniani, at the time being composed by Archbishop Hincmar of Reims, Carloman's mother, Emma, was encouraging her husband to favour Carloman over his brothers. This is the first recorded involvement of Emma in politics, and it may relate to Louis's illness during 869–70. On