Moravia reached its maximum territorial extent in the last years of Svatopluk's reign. According to Regino of Prüm, King Arnulf of East Francia "gave the command of the Bohemians to King Zwentibald of the Moravian Slavs" in 890. Bartl and other Slovak historians write that Svatopluk "probably" also annexed Silesia and Lusatia in the early 890s. According to the "Annals of Fulda", King Arnulf proposed a meeting to Svatopluk in 892, "but the latter in his usual fashion refused to come to the king and betrayed his fidelity and all the things which he had promised before". In response, Arnulf invaded Moravia in 892, but could not defeat Svatopluk, although Magyar horsemen also supported the Eastern Frankish monarch.