of Louis the Blind to the kingdom of Provence, after receiving a personal appeal from Louis' mother, Ermengard, who came to see Arnulf at Forchheim in May 889. Recognising the superiority of Arnulf's position, in 888 king Odo of France formally accepted the suzerainty of Arnulf. In 893 Arnulf switched his support from Odo to Charles the Simple after being persuaded by Fulk, Archbishop of Reims, that it was in his best interests. Arnulf then took advantage of the following fighting between Odo and Charles in 894, harrying some territories of West Francia. At one point, Charles the Simple was forced to flee to Arnulf and ask for his protection. His intervention soon forced Pope Formosus to get involved, as he was worried that a divided and war weary West Francia would be easy prey for the Vikings. In 895 Arnulf summoned both Charles and Odo to his residence at Worms. Charles's advisers convinced him not to go, and he sent a representative in his place. Odo, on the other hand, personally attended, together with a large retinue, bearing many gifts for Arnulf. Angered by the non-appearance of Charles, he welcomed Odo at the Diet of Worms in May 895 and again supported Odo's claim to the throne of West Francia. In the same assembly he crowned his illegitimate son Zwentibold as the king of Lotharingia. Wars with Moravia As early as 880 Arnulf had designs on Great Moravia and had the Frankish bishop Wiching of Nitra interfere with the missionary activities of the Eastern Orthodox priest Methodius, with the aim of preventing any potential for creating a unified Moravian state. Arnulf had formal relations with the ruler of the Moravian Kingdom, Svatopluk, using them to learn the latter's military and political secrets. Later, these tactics were used to occupy the territory of the Greater Moravian state. Arnulf failed to conquer the whole of Great Moravia in wars of 892, 893, and 899. Yet Arnulf did achieve some successes, in particular in 895, when the Duchy of Bohemia broke away from Great Moravia and became his vassal state. An accord was reached between him and Duke of Bohemia Borivoj I. Bohemia was thus freed from the dangers of Frankish invasion. In 893 or 894 Great Moravia probably lost a part of its territory — present-day western Hungary — to him. As a reward, Wiching became Arnulf's chancellor in 892. In