Piast dynasty on the throne of the Piast dynasty 
According to many historical sources, about 960 years
some
Prince Mieszko I of the Piast dynasty united fragmented and ruled by different rulers -
Polish lands. Mieszko I was the son of Prince Polan - Siemomysła. probably before the transition to Christianity, while still a pagan, he had seven wives. But then, the princess married the Czech
Dobrawa, and after her death, Princess Oda. 
probably also is the State Polan, well-organized and located preferably located in a fairly great distance from the mighty kingdoms, which might endanger the further development, has become a leader at that time.
According to legend, the first its creators had to be - Siemowit, Lestek and Siemomysł. However, historical documents relating to that period are quite limited. Virtually nothing is known about the reign of the three kings. It is understood, however, that
ok.960 Duke Mieszko, who already ruled Wielkopolska and Kujawy, attempted to unite the rest lands. He came into the possession
Gdansk Pomerania and West, and later joined his kingdom and
Galicia. Member Area Polan stretched so the Oder in the west to the east of the Bug, from the Baltic to the north and south of the border were the Carpathians.
Mieszko I
based social organization in the country ie kmieciach (peasants) who they farmed their own land. On their shoulders was required to maintain state, because they were obliged by the ruler to make levies for this purpose. And the state military force
Polan team rested on the prince. They were professional soldiers paid pay by the Duke. The rest of the population was required to submit a number of benefits to the prince and his court. During this time, also develop a new profession, created a village specializing in the production of certain goods, ie
villages ministering. pass through the lands Polan numerous
trade routes, which encourages the development of the Polish economy. Traded among others amber, cloth, salt, crafts, slaves. At the same time, numerous new towns
, which are ruled by local princes.
Mieszko I was well also well aware of the need to develop
foreign policy by a state. To better protect the independence of their land, so some had to conclude
alliances that would allow him to further develop the kingdom. Given the choice -
alliance with the powerful Reich or arrangement with the Czech Boleslav, Mieszko I decided to
relationship with the Czech Republic. is born because the opportunity to develop political cooperation partner for more conditions than the Germans. Hence
occurred in 965 to conclude the Mieszko I and Bolesław Czech , pursuant to which had come to the wedding of Prince Polan Dobrawą the Bohemian princess. Marriage is supposed to be the guarantor of earth connection of the two countries, in addition, Mieszko I and his people decided to adopt Christianity at the hands of the Czech Republic. What is extremely important, the Czech Republic undertook to aid in the Christianization of the new lands, by sending missionaries to the territory of the Union Wielicki, and Prussia. Also signed an additional document on cooperation in trade between the two countries.
One of the important reasons for the conclusion of the Polish-Czech were undoubtedly the Czech army raids in the pagan lands of the State Polan. At that time, Europe was already held at that time a Christian, hence the decision to move to a new faith, was irrevocable.
This system has therefore been an important guarantor of peace and security Mieszko And
baptism in 966 Polish became a political event , gave the Piast state, international significance, and also contributed to the development
Christian art and culture . Religion slowly began to unite the country, and the institution
church began to be extremely important for the new dynasty on the Polish throne.
