Rostock, again the humanists received him gladly, and under their protection he wrote against his Greifswald patrons, thus beginning the long list of his satires and fierce attacks on personal or public foes. Rostock could not hold him long, and he wandered on to Wittenberg, where in 1511 he published his Ars Versificatoria, a work on versification. His next stop was Leipzig, and thence to Vienna, where he hoped to win the emperor Maximilian's favour by an elaborate national poem on the war with Venice. But neither Maximilian nor the University of Vienna would lift a hand for him. So Hutten went on to Italy, and settled at Pavia to study law. In 1512, his studies were interrupted by war: in the siege of Pavia by papal troops and Swiss, he was plundered by both sides, and escaped, sick and penniless, to Bologna. On his recovery, he served for a short time as a private soldier in the emperor's army, but by 1514 was back in Germany. Thanks to his poetic gifts and the friendship of Eitelwolf von Stein (d. 1515), he won the favour of the elector of Mainz, Archbishop Albert of Brandenburg. Here high dreams of a learned career rose on him: Mainz should be made the metropolis of a grand humanist movement, the centre of good style and literary form. Strife with Ulrich of Württemberg But the murder in 1515 of his relative Hans von Hutten by Ulrich, duke of Württemberg changed the whole course of Hutten's life; satire, chief refuge of the weak, became his weapon. With one hand he took his part in the famous Epistolæ Obscurorum Virorum (The Letters of Obscure Men), and with the other launched scathing letters, eloquent Ciceronian orations, or biting satires against the duke. These works made him known throughout Germany. Epistolæ Obscurorum Virorum was written in support of Hutten's mentor, the prominent theologian Johannes Reuchlin, who was engaged in a struggle to prevent the confiscation of Hebrew texts. Epistolæ contained a series of fictitious letters, addressed to Hardwin von Grätz, that sarcastically attacked the scholastic theologians who were acting against Reuchlin. Hutten went again to Italy to take the degree of doctor of laws, and returned to Germany in 1517. There the emperor took him under his protection and bestowed on him the honors of a poet's laureate crown and knighthood. However, he also spared Ulrich, duke of Württemberg.