The Piasts and the first state
The Piasts were the first historically documented ruling dynasty of Poland. Their name comes from a legendary ancestor, Piast the wheelwright, whose story was recorded in later chronicles. The dynasty’s real emergence is tied to the Polans, a Slavic people in the region around Gniezno and Poznań in what is now western Poland, in the middle of the tenth century.
Its first well-documented ruler was Mieszko I. He appears in German and other sources as a duke who built a strong military following and expanded his territory. In 966 he accepted baptism, a date accepted by most historians. The reasons were mostly political. Christianity brought him into the community of Christian rulers, reduced the risk of German missionary-backed attacks on pagans, and gave him literate clergy for administration. He is thought to have received his faith through contacts with Bohemia, whose ruler’s daughter he married.
Bolesław the Brave and the crown
Mieszko’s son Bolesław I, called Chrobry, the Brave, expanded the realm and strengthened its church. In the year 1000 Emperor Otto III visited Gniezno, the tomb of Saint Adalbert (Wojciech), a missionary martyred in Prussia. The visit is often called the Congress of Gniezno, and an archbishopric was established there, giving Poland its own church organization. Historians debate how far Otto’s actions amounted to recognition of Bolesław’s royal status.
Bolesław was crowned king shortly before his death in 1025. His wars with the German emperors, especially Henry II, and with neighbors, including campaigns toward Kyiv and Bohemia, drew heavily on a new class of warriors and the resources of the Piast lands. Poland then went through a crisis in the 1030s, including revolts and the pagan reaction, partly overcome by Casimir I the Restorer, who rebuilt the state and moved the center toward Kraków.
Fragmentation
The most important event of the twelfth century was a decision about inheritance. Bolesław III Wrymouth died in 1138, leaving a will, or “testament,” that divided the country among his sons, with a senior prince holding Kraków. The aim was to prevent quarrels. Instead, the system helped open the way to a long period of division, as the heirs’ own lines multiplied and fought each other.
For more than a century Poland was effectively a group of duchies ruled by different Piast branches, such as Silesia, Greater Poland, Lesser Poland and Mazovia. The Silesian Piasts later moved toward German culture and the Bohemian crown. The shared church, language and dynasty nevertheless kept a sense of Polish unity alive, and the archbishopric at Gniezno remained a rallying point.
Settlers, towns and law
In the thirteenth century Piast dukes and nobles invited settlers, including many from German-speaking lands, to open new villages and found towns. Most of these were organized under German town law, sometimes called Magdeburg law, which gave their residents defined rights and self-government. This was part of a wider movement of eastern colonization across central Europe. It helped clear forest, raise revenue and strengthen medieval towns, and it left lasting changes in the Polish landscape and population. Jewish communities also grew in Poland in this period, supported by charters, including one issued in Kalisz in 1264, that set out their rights.
Mongol raids and the Teutonic Knights
Two outside shocks hit the divided Polish lands. In 1241 Mongol forces raided Poland as part of the Mongol invasion of Europe, defeating Polish and allied forces at Legnica and devastating several regions before moving on to Hungary. The raid caused heavy destruction, though the Mongols did not stay.
The second was the arrival of the Teutonic Knights. Duke Konrad of Masovia, harassed by pagan Prussians, invited them in the 1220s to defend his border, and they became an independent state on the Baltic. Within a century they were a serious rival of Poland over lands including Pomerania and the Vistula mouth.
Reunification
The path back to unity ran through rulers such as Przemysł II, who was crowned king in 1295 and killed soon after, and then Władysław I the Elbow-high, who was crowned in Kraków in 1320. It was a kingdom smaller than that of the first Piasts, and without Silesia, which had passed into the Bohemian orbit, but it was real.
Władysław’s son Casimir III, called the Great, ruled from 1333 to 1370. He is traditionally credited with strengthening royal administration, building castles and town walls, founding a university in Kraków in 1364, and making peace with the Teutonic Knights and Bohemia in exchange for territorial concessions. How much credit he deserves is debated, as later tradition made him the model of a wise king. The university’s early existence was brief and uncertain, and it was refounded later.
The end of the line
Casimir had no legitimate son, and when he died the male Piast line of the kingdom ended. The crown passed through Louis of Hungary, a member of the Angevin dynasty, and then to his daughter Jadwiga, whose marriage to Jogaila of Lithuania opened the Jagiellonian era. Piast dukes continued to rule parts of Silesia and Masovia for generations.
The Piast centuries gave Poland its core: a Christian monarchy, a church province, a Slavic language and a network of towns and law, and a pattern of strong nobles that later marked its politics.