Mieszko the Younger time in 1166 or 1167 in a document signed between Mieszko III and Casimir II the Just at the congress in Jędrzejów as one of the sons of the Duke of Greater Poland. Between 1177 and 1179, as a result of the revolt against his father, Mieszko, with his parents and siblings, were exiled from Poland. They probably returned to the country in 1181, when Mieszko III regained the rule over Greater Poland. In 1184 and thanks to the wise diplomatic affairs of his father, Mieszko the Younger was appointed by the sickly Duke Leszek Governor of the Masovian-Kuyavian principality,
Mieszko I of Poland a child became a man. That explains that Mieszko wasn't blind in fact. He was blind only metaphorically. Besides his son's name was also Mieszko and it is hard to believe that he was also blind. In addition, as we know today ancient Slavs used only abstract names among nobility. The third theory links the name of Mieszko with his other name, Dagome, as it appeared in the document called "Dagome iudex". We know this document only from a copy prepared by an anonymous monk who was not familiar with Polish language or Polish names. It is possible that while