A letter of Theotmar of Salzburg and his suffragans evidences that around 900 the Moravians and the Bavarians accused each other of having formed alliances, even by taking oaths "by the means of a dog and a wolf and through other abominable and pagan customs", with the Hungarians. According to Liudprand of Cremona, the Hungarians already "claimed for themselves the nation of the Moravians, which King Arnulf had subdued with the aid of their might" at the coronation of Arnulf's son, Louis the Child, in 900. The "Annals of Grado" adds that a large Hungarian army "attacked and invaded" the Moravians in 900. Facing the threat of further Hungarian attacks, Mojmír II concluded a peace treaty with Louis the Child in 901.