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.
>>>PUT SHARE BUTTONS HERE<<<
👉 Leszek, Duke of Masovia in the context of Casimir II the Just
Casimir II the Just (Polish: Kazimierz II Sprawiedliwy; 28 October 1138 – 5 May 1194) was Duke of Wiślica in Lesser Poland from 1166 to 1173, and Duke of Sandomierz from 1173 onward. In 1177, he became ruler of the Polish Seniorate Province at Kraków and thereby High Duke of Poland — a position he held until his death, though briefly interrupted by his elder brother and predecessor, Mieszko III.
In 1186, Casimir inherited the Duchy of Masovia from his nephew Leszek, becoming the progenitor of the Masovian branch of the royal Piast dynasty and great-grandfather of the later Polish king Władysław I the Elbow-high. The honorific title "the Just" was not contemporary and first appeared in the 16th century.