The late 9th-century "Conversio Bagoariorum et Carantanorum" ("The Conversion of the Bavarians and the Carantanians") makes the first reference to a Moravian ruler. Carantanians (ancestors of present-day Slovenians) were the first Slavic people to accept Christianity from the West. They were mostly Christianized by Irish missionaries sent by the Archdiocese of Salzburg, among them Modestus, known as the "Apostle of Carantanians". This process was later described in the Conversio Bagoariorum et Carantanorum, which states that Mojmír, "duke of the Moravians", expelled "one Pribina" across the Danube. Pribina fled to Ratpot who administered the March of Pannonia from around 833. Whether Pribina had up to that time been an independent ruler or one of Mojmir's officials is a matter of scholarly discussion. For instance, Urbańczyk writes that Mojmir and Pribina were two of the many Moravian princes in the early 9th century, while according to Havlík, Třeštík and Vlasto, Pribina was Mojmír's lieutenant in Nitra. Historians who identify Pribina as the ruler of an autonomous state, the Principality of Nitrafor instance, Bartl, Kirschbaum, and Urbańczykadd that "Great Moravia" emerged through the enforced integration of his principality into Moravia under Mojmír.