The early history of Poland might be thought to begin in the 6th and 8th centuries A.D.
During 6th and 8th centuries lands between the Vistula and Oder Rivers were inhabited by several West Slav tribes. Over time in the long process of struggle for power the most prominent one turned out to be Polanians (Polans or in Polish Polanie). Other tribes included the Vistulanians, Goplans, Opolans, Silesians, Obodritians and Pomeranians.
(How should we link those tribal groups? A question for the historians!)
The begining of the Polish State
There were several strong tribes but after some time of fight for power the
tribe called Polanians (or Polans or in Polish Polanie) came into
prominence. In the middle of the 9th century they started massive expansion to
the neigbouring territories and consequently pushed away Popielid dynasty.
From that period emerges one single ruler Mieszko I of [Piast dynasty]? (born
ca 930 AD). Lands under Duke Mieszko's rule encompassed the following regions:
Greater Poland, probably Lesser Poland, surely Silesia, Eastern Pomerania and
Western Pomerania. The lands totalled to about 250,000 km2 in area, with
population of about 1 million people. Poland's sovereign state
history begins with the duke. Soon he married a Czech princess
Dobrava?, daughter of Bohemian Duke Boleslav I and was baptized
into the Roman branch of Christianity in 966 AD.
This event started widespread conversion to Christianity within Mieszko I realms and was also a fact of political significance. It marked the incorporation of Poland into the
Christian western world. Moreover he allied with the Czech to make his kingdom
independent from the Germans - in fact he was christianed by Czech clergy and
married to a Czech princess. Poland became a Christian state and the date 966
AD it widely regarded a stepping stone for the future of the whole following
Polish history.
In 967 the Polish ruler defeated German Count Wichman and his allies. In 972 at the Battle of Cedynia, Mieszko defeated Hodo of the Eastern Marche, which enabled him to take over West Pomerania. Mieszko I died in 972 and left his son and successor - Boleslaw I Chrobry strong and thriving kingdom.
Boleslaw continued the work of his father. He was able to preserve the unity of the country by expelling Ode (Mieszko I second wife) and her sons. At the Congress of Gniezno? (1000) he was able to persuade Emperor Otto III to give his permission to set up a first Polish archbishopric. Furthermore, the emperor agreed to the coronation of Boleslaw (1025), who became the first King of Poland.
After the untimely death of Otto III in 1002 at the age of 22, Boleslaw I conquered the imperial March of Meissen and also Lausitz (Latin Lusatia), thereby trying to wrest imperial territory for himself during the disputes over the throne -- he and his father had both backed Henry the Quarrelsome against Otto earlier, and he accepted the accession of Henry II of Saxony, the earlier Henry's son. Boleslaw I Chrobry conquered and made himself duke of Bohemia 1003-1004, he defeated the Russians and stormed Kiev? in 1018.
He was forced to give the pledge of allegiance by the next emperor Henry II again, for the lands he held in fief. Henry died in 1024. A year later in 1025, shortly before his death, Boleslaw was crowned. This event marked the full political and territorial independance of the Polish State.
The rule of the Piast Dynasty