Bretislav I (Czech: Břetislav I.; c. 1002 – 10 January 1055), known as the "Bohemian Achilles", of the Přemyslid dynasty, was Duke of Bohemia from 1034 until his death in 1055.
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Youth
Bretislav was the son of Duke Oldřich and his low-born concubine Božena. As an illegitimate son who could not obtain a desirable wife by conventional means, he chose to kidnap Judith of Schweinfurt, a daughter of the Bavarian noble Henry of Schweinfurt, Margrave of Nordgau, in 1019 at Schweinfurt, and marry her.
During his father's reign, in 1019 or 1029, Bretislav took back Moravia from Poland. About 1030, he invaded Hungary in order to prevent its expansion under king Stephen. The partition of Bohemia between Oldřich and his brother Jaromír in 1034 was probably the reason why Bretislav fled beyond the Bohemian border, only to come back to take the throne after Jaromír's abdication.
Raid into Poland
In 1035, Bretislav helped Holy Roman Emperor Conrad II in his war against the Lusatians. In 1039, he invaded Lesser and Greater Poland, captured Poznań, sacked Gniezno, and brought the relics of St. Adalbert, Radim Gaudentius and the Five Brothers back with him. Over the grave of St.Vojtěch in Hnězden he promulgated a set of legal regulations known as Břetislav's Decree (also known as the Hnězden Decree). On the way back, he regained part of Silesia, including Wrocław. His main goal was to set up an archbishopric in Prague and create a large state subject only to the Holy Roman Empire. His raid had an unintended enduring influence on Polish history, as the plundering and destruction of Gniezno forced the next Polish rulers to move their capital to Kraków, which would retain this role for many centuries ahead.


