Casimir is the only Polish king who both received and kept the title of the Great in Polish history ( Bolesław I Chrobry is also called the Great, but his title Chrobry ( Valiant ) is now more common ).

This view is based on the fact that Thietmar of Merseburg in his chronicles named Gunzelin, Gunther's son, brother of Bolesław I the Brave, Dobrawa's son.

Currently, historians believed that Gunzelin and Bolesław I are in fact cousins or brothers-in-law.

# Bolesław I the Brave ( Chrobry ) ( b. 967-d. 17 June 1025 ).

Also, it is unclear why the document does not mention Mieszko's eldest son, Bolesław I the Brave.

Attempts to conquer Prussian land began in 997, when Bolesław I Chrobry, at the urging of the Pope, sent a contingent of soldiers and a missionary ( Adalbert of Prague ) to the pagan Prussians on a crusade of conquest and conversion.

Dark pink area represents Poland at end of rule of Mieszko I of Poland | Mieszko I ( 992 ); light pink area added ( northwest lost ) during reign of Bolesław I the Brave | Bolesław I ( died 1025 ).

Mieszko's son Bolesław I Chrobry established a Polish Church province, pursued territorial conquests and was officially crowned in 1025, becoming the first King of Poland.

This was followed by a collapse of the monarchy and restoration under Casimir I. Casimir's son Bolesław II the Bold became fatally involved in a conflict with the ecclesiastical authority, and was expelled from the country.

At the age of twelve, Hedwig married Henry I the Bearded, son and heir of the Piast duke Bolesław I the Tall of Silesia.

He was the second son of Bolesław I the Brave, but the eldest born from his third wife Emmilda, daughter of Dobromir, possible ruler of Lusatia.

It is thought that the choice of this name for his son was an expression of warming relations between Bolesław I and his stepmother Oda.

Since Mieszko II was politically active before his father's death, Bolesław I the Brave appointed him as his successor.

A few months later Bolesław I the Brave paid homage in person.

Another hypothesis assumes that the territories were transferred by Bolesław I to him, and as a result made Mieszko a vassal of the Empire.

Probably after the wedding, and in accordance with prevailing custom, Bolesław I gave a separate district to Mieszko II to rule: Kraków.

He was released only after the intervention of the Emperor, who, despite the planned betrayal of Bolesław I, loyally acted on behalf of his vassal.

Another pioneer of cinema was Bolesław Matuszewski, who became one of the first filmmakers working for the Lumière company-and the official " cinematographer " of the Russian tsars in 1897.

In the testament of Bolesław III Krzywousty, which initiated the period of fragmentation of Poland ( 1138 – 1320 ), the western part of Greater Poland ( including Poznań ) was granted to Mieszko III the Old.

Hedwig was daughter of the Duke Bolesław the Pious and the Hungarian Princess Blessed Jolenta.

He thereby was the first of the Silesian Piast descendants of Władysław II the Exile to gain the rule over Silesia and the Seniorate Province according to the 1138 Testament of Bolesław III Krzywousty.

She was the daughter of Bolesław III Wrymouth, Duke of Poland, by his second wife Salomea, daughter of Henry, Count of Berg.

According to the Annales Cracovienses Compilati, this event took place in 1136 ; since it can be assumed that the Polish princess was younger than her betrothed, and also are known the birth dates of the youngest children of Bolesław III ( Agnes in 1137 and Casimir in 1138 ), Judith in consequence could have been born between 1130 and 1135.

The congress was organized by Polish king Bolesław Chrobry and Holy Roman Emperor Otto III, and also led to the establishment of bishoprics in Kraków and Wrocław, connecting the territories of the Polish state.

Historically, Lesser Poland was divided into two lands-Kraków Land and Sandomierz Land, both of which emerged after the Testament of Bolesław III Krzywousty.

Also, it is probable that this name Lambert was chosen after Bolesław I's half-brother Lambert.

His older half-brother Bezprym was the son of the Hungarian princess Judith, Bolesław I's second wife.

As Bezprym was the oldest son, there were some who felt that he should have succeeded Bolesław I as king.

Bezprym was rather a commoner's name, which implied that Bolesław I did not wish Bezprym to succeed him ).

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.

A member of the Piast dynasty, he was son of Siemomysł ; grandchild of Lestek ; father of Bolesław I the Brave, the first crowned King of Poland ; likely father of Świętosława ( Sigrid ), a Nordic Queen ; and grandfather of her son, Cnut the Great.

Subsequent loss of the region by Mieszko's son Bolesław Chrobry suggests that the conquest was difficult and the hold over that territory rather tenuous.

The above information, as well as the fact that Bolesław lost Western Pomerania, suggest that the region was not truly incorporated into the Polish state, but only became a fief.

Some sources indicate that Mieszko was not present in Quedlinburg during the gathering ; instead, he had to sent his son Bolesław as a hostage.

Militarily, at the time, Poland was unquestionably a considerable power as Bolesław I was able to fight successful campaigns against both Holy Roman Empire and the Kievan Rus.

It wasn't until Henry's death in 1024, that Bolesław was able to acquire the papal consent for his coronation as Polish king.

However, is known that Władysław Odonic took care properly for the upbringing of his offspring, evidenced by the fact that Bolesław, like his older brother Przemysł I, was able to read and write Latin.

Bolesław, who was finally able to maintain an agreement with Henry III until his death, remained in hostile relations with Konrad of Głogów, thanks in great part to the rebellious and obstinate character of the young Duke.

Bolesław I also managed to establish a Polish church structure with a Metropolitan See at Gniezno, independent of the German Archbishopric of Magdeburg, which had tried to lay claim to Polish areas.

In 1264 Daniel of Galicia and Bolesław V the Chaste met in the town to establish the borders of their domains.

Stanisław then encouraged King Bolesław to establish Benedictine monasteries to aid in the Christianization of Poland.