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| | c. Poland. 2001. The Encyclopedia of World History |
 | | Vladislav I (Ladislas), an indolent and unwarlike ruler, brother of Boleslav. |
 | | Boleslav completed the organization of the state, in which the great landlords (nobiles, or magnates) and gentry (milites, knights, or szlachta) had become well-defined social classes, the peasantry having steadily lost ground in the periods of confusion. |
 | | Boleslav IV, an ineffectual ruler, during whose reign the Germans, under Albert the Bear and Henry the Lion, supported by Waldemar of Denmark, drove back the Poles from the entire territory along the Baltic and west of the Vistula (1147). |
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