Thietmar refers to the two sons of Boleslaw by his wife Emnilde as "Miesco and another…named after his beloved lord [Otto]". The Chronicæ Polanorum names "secundus Mescho" as son of "magnus Bolezlavum". The Annales Kamenzenses record the birth in 990 of "Mesco filius Bolezlai". The Annales Silesiaci Compilati record the birth in 990 of "Boleslau filius Meczko". The Chronica principum Polonie records that "Boleslaus" had "filium Meziconem secundum" in 990.
He succeeded his father in 1025 as MIESZKO II King of Poland. He launched raids on the territory of the Ostmark in 1030, devastating hundreds of villages. A German-Russian coalition defeated King Mieszko in 1030, conquered territory, divided what remained of Poland between members of the Piast dynasty and forced the king to send his crown to Germany. The country descended into civil war.
The Annales Cracovienses Vetusti record the death in 1034 of "Mysko rex Poloniorum". The necrology of Merseburg records the death "10 May" of "Lanpertus sive Misico dux poloniorum". 1
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