On this day in ...
... 1018, 15 years of war between Henry II, the Holy Roman Emperor, and a Polish Great Duke known as Bolesław I the Brave ended by signature of the treaty, the Peace of Bautzen, at Schloß Ortenburg (left) atop the Saxony city for which the treaty is named. As with many accords of the day, peace depended on a division of disputed lands and the claiming as wife of the daughter of another noble family -- in this case Oda von Meißen, who'd become Queen of Poland.
(Prior January 30 posts are here and here.)