Mieszko II was not only imprisoned but also castrated, which was to be a punishment to Bolesław I the Brave, who blinded Duke Boleslaus III the Red ( Oldřich's brother ) thirty years before.

Poznań's cathedral was the place of burial of the early Piast monarchs ( Mieszko I, Boleslaus I, Mieszko II, Casimir I ), and later of Przemysł I and King Przemysł II.

* 995 – Members of Slavník's dynasty – Spytimír, Pobraslav, Pořej and Čáslav are murdered by Boleslaus's son, Boleslaus II the Pious.

* Ladislaus Herman succeeds Boleslaus II in Poland.

In the following months Boleslav's brothers Jaromir and Oldrich flee to Germany and place themselves under the protection of Henry II, Holy Roman Emperor, while Boleslaus III of Bohemia orders massacre of his leading nobles at Vyšehrad.

* February 7 – Boleslaus II, Duke of Bohemia

* Casimir II of Poland succeeds Boleslaus IV of Poland on the throne.

* Boleslaus II of Bohemia massacres the Slavnik's dynasty at Libice.

* Boleslaus II takes office as duke of Poland.

* Boleslaus II the Pious succeeds Boleslav I in Bohemia.

Among those who did supported Henry II's claims, however, were Duke Mieszko I of Poland and Duke Boleslaus II of Bohemia.

One of the Empress's greatest achievements was her success in maintaining German supremacy over Bohemia, as Duke Boleslaus II of Bohemia was forced to accept the authority of Otto III.

He died in 972 and was succeeded as Duke by his oldest son Boleslaus II.

After initially siding with Duke Henry II of Bavaria against Emperor Otto II during Henry's failed revolt in 977, Boleslaus II swore loyalty to Otto II.

When Otto II died suddenly in 983 and was succeeded by the three-year old Otto III, Boleslaus II again supported Henry II in his bid for the German throne.

As in 977, when Henry's bid failed, Boleslaus II swore loyalty to Otto III.

* April 7 – Boleslaus George II of Halych ( b. 1308 ), duke of Masovia

He and his advisor, Bishop Abraham of Freising, conspired with the Duke of Poland Mieszko I and the Duke of Bohemia Boleslaus II against Otto II in 974.

When Wenceslaus I was assassinated in 935, his brother Boleslaus I succeeded him as Duke and refused to continue paying the annual tribute to Germany.

To strengthen the Bohemian-Polish alliance, Boleslaus I's daughter Dobrawa was married to the pagan Mieszko I of Poland in 965.

A legend links Szczerbiec with King Boleslaus the Brave who was said to have chipped the sword by hitting it against the Golden Gate of Kiev ( now in Ukraine ) during his capture of the city in 1018.

According to a local legend, Mieszko, son of Boleslaus II of Poland dreamt he was attacked by a band of brigands in a forest.

Boleslaus I the Cruel, also called Boleslav I () ( – 15 July, 967 or 972 ), was the ruler ( kníže, literally " prince ," but usually translated as " duke ") of Bohemia from 935 to his death.

He was succeeded by his oldest son Boleslaus the Pious.

She was a daughter of Boleslaus of Greater Poland and Jolenta of Hungary.

This city was conquered by Boleslaus III of Poland in 1107.

In 1018 the Peace of Bautzen was signed between the German king Henry II and the Polish prince Boleslaus I.

The city was named either after a chieftain, or the son of Princess Judith ( elder sister of St. Stephen of Hungary ), who settled here after her husband Boleslaus I of Poland expelled her and her son.

During the reign of King Boleslaus the Brave, there was a fortified settlement here, which protected the ford across the Warta on an important trade route from Silesia to Poznań.

The March of Moravia was given to Boleslaus I after the defeat of the Magyars at the Battle of Lechfeld in 955, but it was conquered into the Duchy of Poland by Bolesław I Chrobry in 999.

Significantly, the bishopric of Prague, founded in 973 during the reign of Boleslaus II ( 967 – 99 ), was subordinated to the archbishopric of Mainz.

Boleslaus II the Pious () ( c. 932-7 February 999 ) was Duke of Bohemia from 972, a member of the Přemyslid dynasty.

In 977, Boleslaus again attacked Bavaria, but on this occasion was barred from annexing any lands by Otto II.

War between Poland and Bohemia was continual in this period, and by 990 Boleslaus had occupied Silesia.

* February 9 – Boleslaus III of Bohemia is restored to authority with armed support from Bolesław I the Brave of Poland.

One of the plates had already been broken by that time with only part of the inscription preserved: Liste est glaud ... h Bolezlai Duc ... (" This is a sword of ... Duke Boleslaus ..."); the inscription on the other plate continued: Cum quo ei Dn SOS Omnipotens Salvator auxiletur adsus partes amen (" With whom is the Omnipotent Lord and Savior, to help him against his enemies.

At the age of eight Vladimir put him in charge of Turov and later arranged his marriage with the daughter of the Polish king Boleslaus I.

Boleslaus maintained good relations with the Ottonian German kings, and in 975 supported Otto II during the civil war against Henry II, Duke of Bavaria.

Together with Přemyslids led by Boleslaus II the Pious they rivalised with Slavniki clan.

A quarrel broke out in Poland over the succession, with Bořivoj and his cousin Svatopluk supporting Zbigniew against the legitimate heir Boleslaus III of Poland.

Bořivoj attacked in 1108 with the aid of Boleslaus in alliance with Coloman, whom Svatopluk and Henry were jointly attacking in Hungary.

He received his episcopal consecration on the following March 28 from Bishop Chartrand, with Bishops Alphonse John Smith and Emmanuel Boleslaus Ledvina serving as co-consecrators.

For his service to the Dukes of Greater Poland, most notably to Boleslaus the Pious and to Przemysł II he was awarded on January 8, 1294, with the village of Polanowo.

In 1132, King Boleslaus III of Poland led a campaign with Rus ' and Polish troops on Boris ' behalf.