Mieszko the Younger Mieszko the Younger Mieszko the Younger (also known as of Kalisz) () (between 1160 and 1165 – 2 August 1193) was a Duke of Kalisz since 1191 until his death. He was the second child (but fourth-born son) of Mieszko III the Old, Duke of Greater Poland and since 1173 High Duke of Poland, by his second wife Eudoxia, daughter of Grand Prince Iziaslav II of Kiev. We do not know when he was born. His older brother, Bolesław, was born in 1159, while his younger brother Władysław Laskonogi was alive in 1166 or 1167. Mieszko appeared for the first
Mieszko I, Duke of Cieszyn The Obituary of the Church of St. Vincent in Wrocław showed the existence of a certain "Grzymisława, Duchess of Opole" ("Grimizlaua ducissa Opuliensis") who was buried there around 13 September 1286. Her parentage is also unknown, but her name suggests a Russian origin, probably member of the Rurikids. Her title suggests that she may have been the wife of Mieszko I or the first wife of Bolko I (Mieszko I's brother), or maybe a completely different person. Also, the exact date of their marriage was uncertain, but after a further reconstructions of their children's birth dates, was placed between 1275