During the eleventh century and the first half of the twelfth century, the building of the Polish state continued under a series of successors to Boleslaw I. But by 1150, the state had been divided among the sons of Boleslaw III, beginning two centuries of fragmentation that brought Poland to the brink of dissolution.

Fragmentation and Invasion, 1025-1320

The most fabled event of the period was the murder in 1079 of Stanislaw, the bishop of Kraków. A participant in uprisings by the aristocracy against King Boleslaw II, Stanislaw was killed by order of the king. This incident, which led to open rebellion and ended the reign of Boleslaw, is a Polish counterpart to the later, more famous assassination of Thomas ą Becket on behalf of King Henry II of England. Although historians still debate the circumstances of the death, after his canonization the martyred St. Stanislaw entered national lore as a potent symbol of resistance to illegitimate state authority--an allegorical weapon that proved especially effective against the communist regime.

During the eleventh and twelfth centuries, Poland lost ground in its complex triangular relationship with the German Empire to the west and the kingdom of Bohemia to the south. New foreign enemies appeared by the thirteenth century. The Mongol invasion cut a swath of destruction through the country in 1241; for fifty years after their withdrawal in 1242, Mongol nomads mounted devastating raids into Poland from bases in Ruthenia to the southeast. Meanwhile, an even more dangerous foe arrived in 1226 when a Polish duke invited the Teutonic Knights, a Germanic crusading order, to help him subdue Baltic pagan tribes. Upon completing their mission with characteristic fierceness and efficiency, the knights built a stronghold on the Baltic seacoast, from which they sought to enlarge their holdings at Polish expense. By that time, the Piasts had been parceling out the realm into ever smaller units for nearly 100 years. This policy of division, initiated by Boleslaw II to appease separatist provinces while maintaining national unity, led to regional governance by various branches of the dynasty and to a near breakdown of cohesiveness in the face of foreign aggression. As the fourteenth century opened, much Polish land lay under foreign occupation (two-thirds of it was ruled by Bohemia in 1300). The continued existence of a united, independent Poland seemed unlikely.

The Later Piasts

In the fourteenth century, after a long period of instability and growing menace from without, the Polish state experienced a half century of recovery under the last monarchs of the house of Piast. By 1320 Wladyslaw Lokietek (1314-33), called the Short, had manipulated internal and foreign alignments and reunited enough territory to win acceptance abroad as king of an independent Poland. His son Kazimierz III (1333-70) would become the only Polish king to gain the sobriquet "great." In foreign policy, Kazimierz the Great strengthened his country's position by combining judicious concessions to Bohemia and the Teutonic Knights with eastward expansion.

While using diplomacy to win Poland a respite from external threat, the king focused on domestic consolidation. He earned his singular reputation through his acumen as a builder and administrator as well as through foreign relations. Two of the most important events of Kazimierz's rule were the founding of Poland's first university in Kraków in 1364, making that city an important European cultural center, and his mediation between the kings of Bohemia and Hungary at the Congress of Kraków (also in 1364), signaling Poland's return to the status of a European power. Lacking a male heir, Kazimierz was the last ruler in the Piast line. The extinction of the dynasty in 1370 led to several years of renewed political uncertainty. Nevertheless, the accomplishments of the fourteenth century began the ascent of the Polish state toward its historical zenith.

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Source: U.S. Library of Congress