The eldest son of Duke Boleslaus II "the Pious", probably with his first wife Adiva, he succeeded to the Bohemian throne upon the death of his father in 999. Boleslaus III turned out to be a weak ruler and soon entered into a fierce inheritance conflict with his younger brothers Jaromír and Oldřich. He had both expelled to the Bavarian court of Henry II in Regensburg, together with their mother Dowager Duchess Emma.
By 1002, a revolt organized by nobles of the rivalling Vršovci clan (along with Boleslaus's son-in-law) forced himself to flee to Germany, where he was received by Margrave Henry I of Austria. At first, Henry I ordered the arrest of his guest because of an old offence, but soon forgave him and promised support. Meanwhile, the Polish duke Bolesław I installed Boleslaus' kinsman Vladivoj on the Bohemian throne, however, he apparently was an alcoholic and died within a year. After the death of Vladivoj in 1003, the Bohemian nobles invited Jaromír and Oldřich back from exile. In turn, they each later assumed the throne at Prague.
On 9 February 1003, Boleslaus the Red was restored to authority with armed support from Duke Bolesław of Poland. Boleslaus's brothers Jaromír and Oldřich again fled to Germany and placed themselves under the protection of Henry II. Boleslaus soon undermined his own position by ordering a massacre of his leading nobles, the Vršovci, at Vyšehrad. According to the chronicler Thietmar of Merseburg, Boleslav slashed his son-in-law to death with his own sword.
Nobles who survived the massacre secretly sent messengers to Bolesław the Brave of Poland and entreated him to save them. The Polish duke willingly agreed and invited his Czech namesake to visit him at his castle (probably in Kraków). There, Boleslaus the Red was trapped, blinded and imprisoned. He never returned to Bohemia, probably dying in captivity some thirty years later. Bolesław the Brave claimed the ducal throne for himself, invaded Bohemia in 1003 and took Prague without any serious opposition; he ruled as Duke Boleslaus IV for a little over a year. He then gave up his claim to the duchy of Bohemia and was replaced by Jaromír, who, backed by Henry II, entered through the Prague gates and in 1004 received the Bohemian duchy as a fief from the hands of the German king.
See also
Thietmar of Merseburg. Chronik. Neu übertragen und erläutet von W. Trillmich, B. 1957.
