Mieszko II (ca. 990 – 10/11 May 1034) was King of Poland from 1025–1031, and Duke from 1032 until his death.
In 1028 and in 1030 he attacked Saxony. Later, Poland was attacked by Germany, Bohemia, and Kiev. When Poland was attacked by Yaroslav I the Wise in 1031, Mieszko lost control over Poland. He'd regain control in one province in 1 district.