Fighting soon resumed, however, after an unsuccessful assassination attempt against Bolesław—which he believed had been ordered by Henry, who denied the charge—occurred soon after the peace was concluded. Bolesław took control of Bohemia, having previously acquired Moravia and Slovakia. In the ensuing struggle Bolesław allied himself with the Holy Roman Empire's noble opposition to Henry, while the emperor sought support among the Lutici, a Slavic pagan Polabian tribe. An intermediate peace was concluded in Merseburg in 1013 which preserved the territorial status quo, with Bolesław holding on to Moravia and Slovakia, while Jaromir was made the ruler of Bohemia (though he was soon deposed by his brother Oldrich). Bolesław however agreed to support the Emperor's Italian campaign. Open warfare continued when Bolesław I did not comply with this condition, and instead supported Henry II's Italian adversaries. Henry II was however unable to defeat Bolesław I, and agreed on a peace in Bautzen (1018) which left the Duke of Poland in charge of the Lusatian march and Upper Lusatia. The two rulers also strengthened the dynastic bonds between them through Bolesław's marriage with Oda, first daughter of Margrave Eckard. The emperor also promised to aid Bolesław in his expedition against Ruthenia in the summer of 1018 with contingents of German and Hungarian troops which enabled the Polish ruler to capture Kiev and annex a part of Red Ruthenia.