Born in Gnesen, Jahnke immigrated to the United States in 1899, became a naturalized citizen, and served in the U.S. Marines in the Philippines.
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His raid had an unintended enduring influence on Polish history, as the plundering and destruction of Gniezno pushed the next Polish rulers to move their capital to Kraków, which would retain this role for many centuries ahead.
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In 1039 he invaded Little and Great Poland, captured Poznań and sacked Gniezno, bringing the relics of St. Adalbert, Radim Gaudentius and the Five Brothers back with him.
The Bishops of Münster and Paderborn, fired by the example of Clemens August, recalled the assent they had formerly given to the agreement; while Martin von Dunin, the Archbishop of Gnesen (Gniezno) and Posen (Poznań), was imprisoned at Kolberg (Kołobrzeg) for the same offence that had sent Clemens August to Minden.
The destruction of Gniezno pushed the Polish rulers to move their capital to Kraków.
Radim Gaudentius (970- 106/1020), a member of Slavnik's dynasty, was the first archbishop of Gniezno from 1000 until 1006/1020.
At the same time when the Kingdom of Germany grew out of the German stem duchies of East Francia in the 10th century, the West Slavic Polan tribes under the Piast prince Mieszko I about 960 were able to establish a sovereign state around Poznan and Gniezno in an area later called Greater Poland.
Józef Kowalczyk (born 1938), Polish clergyman, archbishop of Gniezno
Prince Michał Jerzy Poniatowski, born Michał Jerzy Poniatowski (October 12, 1736 – August 12, 1794) was a Polish nobleman, abbot of Tyniec and Czerwińsk, Bishop of Płock and Coadjutor Bishop of Kraków from 1773, and Archbishop of Gniezno and Primate of Poland from 1784.