 Henry II also promised to support Bolesław I in the Polish ruler's expedition to Kiev to ensure his son-in-law, Sviatopolk, claimed the Kievan throne.To seal the peace, Bolesław I, then a widower, reinforced his dynastic bonds with the German nobility by marrying Oda of Meissen, daughter of the Saxon Margrave Eckard I of Meissen.Henry II's involvement in Italian politics and his coronation as Emperor inevitably brought him into conflict with the Byzantine Empire.