Marriage with Bolesław I
Since the death of his third wife Emnilda in 1017, Bolesław I began to look a suitable new consort, and he turned his attention to the Holy Roman Empire. On 30 January 1018 the Peace of Bautzen was signed between Emperor Henry II and the Polish ruler; during the preliminary negotiations of this treaty in Ortenburg Castle, was decided that the widower Bolesław I would reinforced his dynastic bonds with the German nobility through a marriage. The chosen bride was the much younger Oda, whose eldest brother Margrave Herman I of Meissen gave his consent as the head of the Ekkehardiner family. Accompanied by her brother and Bolesław I's son Otto, Oda traveled to Cziczani (also spelled Sciciani, at the site of either modern Groß-Seitschen or Zinnitz or Zützen) Castle, the residence of the Piasts in Lower Lusatia. There, she was received with a sea of lights when she arrived at night by Bolesław I and a large crowd. The marriage is believed to be celebrated in simple secular rite followed (at best with a subordinate ecclesiastical contribution, especially since the church only began to be interested in the institute of marriage at this point in time) four days later after the formal signing of the peace treaty, on 3 February 1018 or a few days later.
In his chronicle, written between 1012 and 1018, Thietmar of Merseburg provides the only contemporary report of the wedding celebrations. According to his comments, he criticizes the marriage and paints a gloomy picture of Oda's future: he says that "from now she has lived outside the law of matrimony and thus in a manner unworthy for a noble lady like her", because the wedding was celebrated into against the rules of the Church and without its consent during Lent. The following remarks by Thietmar seem to confirm his prediction. In connection with the victory over Yaroslav the Wise, Grand Prince of Kiev, he describes Bolesław I as an "old bastard" (antiquus fornicator), who made Yaroslav's captive sister, Predslava, his concubine, regardless of his wife and against any law. It is doubtful whether conclusions can be drawn about the marriage with Oda from this. According to the Polish historian Andrzej Pleszczyński, Bolesław I's behavior cannot be measured against today's moral standards. In doing so, he had fulfilled archaic expectations of a victorious ruler, which at that time were much more deeply rooted in his domains than Christian values.
According to older interpretations of Thietmar's Chronicle, his criticism is also directed against Oda. The phrase sine matronali consuetudine whom he wrote about her, should be translated as "without virginity". Oda thus led a dissolute way of life prior to her wedding and not as it would have been worthy of such a respected marriage. German historian Robert Holtzmann comments on Thietmar's reports, which he also understands, as a kind of "bitter irony".
In addition to the significance for Oda's personal fate, the marriage of Bolesław I had a political dimension. The union was concluded as a part of the Peace of Bautzen signed between Emperor Henry II and the Polish. With this treaty, their almost two decades-long disputes about rank, honor and reputation, but also about territorial claims over the March of Lusatia, the Milceni land and the adjacent Sorbian Meissen finished. On Henry II's campaigns against Bolesław I, Oda's family was part of a "Polish-friendly alliance party", alongside the powerful Billunger dynasty, who only hesitantly involved. The marriage renewed the traditional friendship between Piast and Ekkehardiner dynasties after the daughter of Bolesław I, Regelinda, who was married with Oda's brother Margrave Herman I of Meissen, died in 1016. In addition, Bolesław I's prestigious marriage with Oda, a high-ranked noble German lady, restored his honor and was an expression of his victory. In the Peace of Bautzen, Bolesław I was as the clear winner, as he was able to maintain his sovereignty over the March of Lusatia and the Milceni land, to which he was entitled because of his third marriage to Emnilda, a daughter of the Lusatian prince Dobromir, just as claimed as the Ekkehardiner family. And finally, there are no more attacks by Bolesław I on the neighboring Margraviate of Meissen, ruled by Oda's brother Herman I.