Jaromír duke of Bohemia on 8 September. Bolesław's ally Soběslav died in this campaign. During the next part of the offensive King Henry retook Meissen and in 1005, his army advanced as far into Poland as the city of Poznań where a peace treaty was signed. According to the peace treaty Bolesław lost Lusatia and Meissen and likely gave up his claim to the Bohemian throne. Also in 1005, a pagan rebellion in Pomerania overturned Bolesław's rule and resulted in the destruction of the newly established local bishopric. In 1007, after learning about Bolesław's efforts to gain allies among Saxon nobles and giving refuge to the deposed duke of Bohemia, Oldřich, King Henry denounced the Peace of Poznań, which caused Bolesław's attack on the Archbishopric of Magdeburg as well as the re-occupation of the marches of Lusatia, though he stopped short of retaking Meissen. The German counter-offensive began three years later (previously, Henry was occupied with rebellion in Flanders), in 1010, but it was of no significant consequence. In 1012, another ineffective campaign by archbishop Walthard of Magdeburg was launched, as he died during that campaign and, consequently, his forces returned home. Later that year, Bolesław once again invaded Lusatia. Bolesław's forces pillaged and burned the city of Lubusz (Lebus). In 1013, a peace accord was signed at Merseburg. As part of the treaty, Bolesław paid homage to King Henry for the March of Lusatia (including the town of Bautzen) and Sorbian Meissen as fiefs. A marriage of Bolesław's son Mieszko with Richeza of Lotharingia, daughter of the Count Palatine Ezzo of Lotharingia and granddaughter of Emperor Otto II, was also performed. During the brief period of peace on the western frontier that followed, Bolesław took part in a short campaign in the east, towards the Kievan Rus' territories. In 1014, Bolesław sent his son Mieszko to Bohemia in order to form an alliance with Duke Oldrich against Henry, by then crowned emperor. Oldrich imprisoned Mieszko and turned him over to Henry, who, however, released him in a gesture of good will after being pressured by Saxon nobles. Bolesław nonetheless refused to aid the emperor militarily in his Italian expedition. This led to imperial intervention in Poland and so in 1015 a war erupted once again. The war started out well for the emperor, as he was able to defeat the Polish forces at the Battle of Ciani. Once the