In the past historians were unsure which wife of Bolesław IV the Curly was the mother of Leszek: the first, Wierzchosława, daughter of St. Vsevolod, Prince of Novgorod and Pskov, or the second, Maria. According to chronicler Jan Długosz, Leszek was the son of Anastazja, a princess of Halych and the first wife of Bolesław IV. Oswald Balzer found this information to be incorrect, as the first wife of Bolesław IV was named Wierzchosława and she was not from Halych.
