Mieszko II Lambert (About this sound Polish ; c. 990 – 10/11 May 1034) was King of Poland from 1025–1031, and Duke from 1032 until his death.He was the second son of Bolesław I Chrobry, but the eldest born from his third wife Emmilda, daughter of Dobromir, possible ruler of Lusatia. He was probably named after his paternal grandfather, Mieszko I. His second name, Lambert, sometimes erroneously considered to be a nickname, was given to him as a reference to the cult of Saint Lambert.