his attempts to conquer Moravia, in 899 Arnulf reached out to Magyars who had settled in the Carpathian Basin, and with their help he imposed a measure of control over Moravia. King of Italy and Holy Roman Emperor In Italy Guy III of Spoleto and Berengar of Friuli fought over the Iron Crown of Lombardy. Berengar had been crowned king in 887, but Guy was then crowned in 889. While Pope Stephen V supported Guy, even crowning him Roman Emperor in 891, Arnulf threw his support behind Berengar. In 893 the new Pope Formosus, not trusting the newly crowned co-emperors Guy and his son Lambert, sent an embassy to Omuntesberch, where Arnulf was meeting with Svatopluk, to request that Arnulf come and liberate Italy, where he would be crowned emperor in Rome. Arnulf met the Primores of the Kingdom of Italy, dismissed them with gifts and promised to assist the pope. Arnulf then sent Zwentibold with a Bavarian army to join Berengar. They defeated Guy but were bought off and left in autumn. When Pope Formosus again asked Arnulf to invade, the duke personally led an army across the Alps early in 894. In January 894 Bergamo fell, and Count Ambrose, Guy's representative in the city, was hung from a tree by the city's gates. Conquering all of the territory north of the Po River, Arnulf forced the surrender of Milan and then drove Guy out of Pavia, where he was crowned King of Italy. Arnulf went no further before Guy died suddenly in late autumn, and a fever incapacitated his troops. His march northward through the Alps was interrupted by Rudolph I of Burgundy, and it was only with great difficulty that Arnulf crossed the mountain range. In retaliation, Arnulf ordered Zwentibold to ravage Rudolph's kingdom. In the meantime, Lambert and his mother Ageltrude travelled to Rome to receive papal confirmation of his imperial succession, but when Pope Formosus, still desiring to crown Arnulf, refused, he was imprisoned in Castel Sant'Angelo. In September 895 a new papal embassy arrived in Regensburg beseeching Arnulf's aid. In October Arnulf undertook his second campaign into Italy. He crossed the Alps quickly and again took Pavia, but then he continued slowly, garnering support among the nobility of Tuscany. Maginulf, Count of Milan, and Walfred of Friuli joined him. Eventually even Adalbert II of Tuscany abandoned Lambert. Finding Rome locked against him and held