on their work. Saint Clement of Ochrid said: In his letter Quia te zelo, the pope addressed Svatopluk as rex Sclavorum ("king of the Slavs"). Although Svatopluk's royal title was not recognized by the contemporary Annals of Fulda, the chronicler Regino of Prüm also referred to Svatopluk as rex Marahensium Sclavorum ("king of the Moravian Slavs") in the early 10th century, which is independent evidence confirming that Svatopluk held the title of king. According to the late 12th-century Chronicle of the Priest of Duklja, Svatopluk had been crowned "king in the Roman fashion on the field of Dalma" in the presence of a papal legate, cardinals, and bishops. In 887 Arnulf, Svatopluk's opponent in the "Wilhelminer War", became the king of East Francia. They met at Omuntesperch, a locality that has yet not been identified, during the winter of 890. At the meeting Svatopluk transmitted to Arnulf a message from Pope Stephen V, urging the king to invade Italy to protect the Holy See. According to Regino of Prüm, the two monarchs also concluded an agreement, in which Arnulf ceded the ducatus of the Bohemians to Svatopluk. Sometime during 891, according to the Annals of Fulda, Arnulf sent an embassy led by margrave Arbo to Moravia in order to renew the peace. A letter written by the margrave soon announced that the legates were returning from Svatopluk and the Moravians who had agreed "to give themselves in friendship". Svatopluk, however, broke his pledges, so Arnulf decided to invade Moravia in 891. First the king met with Braslav, the Slavic dux on the river Sava, then raised an army of Franconians, Bavarians and Alamanni, and also recruited Hungarians to join his campaign. In the late 10th century, Arnulf was accused by Ottonian authors of unleashing the Hungarians on Europe because of his desire to bring down Moravia. Arnulf's invasion started in July 892, but he failed to defeat Svatopluk. The war against Moravia seems to have continued until 894. This was the year of Svatopluk's "most unlucky death", according to the Annals of Fulda, which implies that he met his end in some kind of mishap, the sort that occurs in war. The exact circumstances of Svatopluk's death, however, are unknown. Simon of Kéza recorded that he died in battle near Környe Legacy Following Svatopluk's death, Great Moravia, which had achieved its maximum territorial extension, and exercised its greatest influence in