Mieszko I Dagon of Poland Grand Duke ²⁶⁰

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Mieszko I (ca. 930 - 25 May 992) was the ruler of the Polans from about 960 until his death. A member of the Piast dynasty, he was a son of Siemomysl, and a grandchild of Lestek. He was the father of Boleslaw I the Brave (the first crowned king of Poland) and Gunhild of Wenden with his wife Oda. Most sources make Mieszko I the father of Sigrid the Haughty, a Nordic Queen, though one source identifies her father as Skoglar Toste, and the grandfather of Cnut the Great (Gundhild's son), and the great-grandfather of Gunhilda of Denmark, Canute the Great's daughter and wife of Henry III, Holy Roman Emperor.

The first Christian ruler of Poland, Mieszko I is considered the de facto creator of the Polish state. He continued the policy of both his father and grandfather, who were rulers of the pagan tribes located in the area of present-day Greater Poland. Through both alliances and the use of military force, Mieszko extended ongoing Polish conquests and early in his reign subjugated Kuyavia and probably Gdansk Pomerania and Masovia. For most of his reign, Mieszko I was involved in warfare for the control of Western Pomerania, eventually conquering it up to the vicinity of the lower Oder river. During the last years of his life, he fought the Bohemian state, winning Silesia and probably Lesser Poland.

Mieszko I's marriage in 965 to the Czech Premyslid princess Dobrawa and his baptism in 966 put him and his country in the cultural sphere of Western Christianity. Apart from the great conquests accomplished during his reign (which proved to be fundamental for the future of Poland) Mieszko I was renowned for his internal reforms, aimed at expanding and improving the so-called war monarchy system.

According to existing sources, Mieszko I was a wise politician, a talented military leader, and a charismatic ruler. He successfully used diplomacy, concluding alliances, first with Bohemia, then Sweden, and the Holy Roman Empire. In foreign policy, he placed the interests of his country foremost, even entering into agreements with his former enemies. On his death, he left to his sons a country with greatly expanded territories, and a well-established position in Europe.

Mieszko I also enigmatically appeared as "Dagome" in a papal document dating to about 1085, called Dagome iudex, which mentions a gift or dedication of Mieszko's land to the Pope (the act took place almost a hundred years earlier).

Mieszko blev gift med Dubrava|Dobrawa|Dubrawka of Bohemia, datter af Boleslaus I (the Gruesome) Duke of Bohemia og Biagota von Stockow, i 965. (Dubrava|Dobrawa|Dubrawka of Bohemia blev født omkring 940-945 i Praha - Prag, Bohemia, Czechoslovakia og døde i 977.)

Mieszko blev derefter gift med Oda von Haldensleben, datter af Dietrich von Haldensleben, Markgraf der Nordmark og N.N. (Oda von Haldensleben blev født omkring 955-960 og døde i 1023.)