833–54) was the East Frankish prefect of the Eastern March (marcha orientalis), the Bavarian frontier towards the Slavs, appointed in 833.
In 833, according to the Conversio Bagoariorum et Carantanorum, a Slavic prince, Pribina, had been "driven across the Danube by Mojmir, duke of the Moravians",[2] and fled to Radbod in East Francia around 833.
[4] Before long, however, Radbod and Pribina fell out, and the latter, fearing for his life, fled with his son Koceľ to the First Bulgarian Empire, and then to Lower Pannonia ruled by a Slavic duke, Ratimir.
[4][5] Radbod held contacts with Rastislav (r. 847–70), ruler of the Moravians (successor to Mojmir), who had long posed a danger to Bavaria.
[1] According to the Annals of St-Bertin, in 853 Charles the Bald, king of West Francia, bribed the Bulgarians to ally with the Slavs (apparently the Moravians) and together attack Louis the German's kingdom.