Bolesław IV the Curly (Polish: Bolesław Kędzierzawy; c. 1122 – 5 January 1173), a member of the Piast dynasty, was Duke of Masovia from 1138 and High Duke of Poland from 1146 until his death in 1173.
Bolesław IV the Curly (Polish: Bolesław Kędzierzawy; c. 1122 – 5 January 1173), a member of the Piast dynasty, was Duke of Masovia from 1138 and High Duke of Poland from 1146 until his death in 1173.
Leszek of Masovia (Polish: Leszek, also Lestek; b. ca. 1162 - d. 1186) was a Polish prince from the Piast dynasty, the Duke of Masovia from 1173 until his death. He was the only son of Bolesław IV the Curly, Duke of Masovia and High Prince of Poland, to survive his father. After his father's death he inherited Masovia. At the beginning, Leszek ruled under the guardianship of his uncle Casimir II the Just. He was a man of poor health. For a short time he supported his other uncle, Mieszko III the Old, but later decided to reconcile with Casimir II, who after Leszek's death inherited his duchy.
The last will and testament of the Piast duke Bolesław III Wrymouth of Poland, established rules for governance of the Polish kingdom by his four surviving sons after his death. By issuing it, Bolesław planned to guarantee that his heirs would not fight among themselves, and would preserve the unity of his lands under the Piast dynasty. However, soon after his death his sons fought each other, and Poland entered a period of fragmentation lasting about 200 years.
The Eastern Neisse, also known by its Polish name of Nysa Kłodzka (German: Glatzer Neiße, Czech: Kladská Nisa), is a river in southwestern Poland, a left tributary of the Oder, with a length of 188 km (21st longest) and a basin area of 4,570 km (3,742 in Poland).
Prior to World War II it was part of Germany. During the Yalta Conference it was discussed by the Western Allies as one possible line of the western Polish border. Attempts were made to negotiate a compromise with the Soviets on the new Polish-German frontier; it was suggested that the Eastern Neisse be made the line of demarcation. This would have meant that (East) Germany could have retained approximately half of Silesia, including most of Wrocław (formerly Breslau). However the Soviets rejected the suggestion at the Potsdam Conference and insisted that the southern boundary between Germany and Poland be drawn further west, at the Lusatian Neisse, in some way reintroducing the border to the place from the beginnings of Polish statehood, i.e. west of Legnica Town, important for Bolesław IV the Curly and Henry the Bearded, two Polish Princepses.