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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.
The Poland-wide Youth Meeting Lednica 2000 (known as Lednica) is a major annual gathering of Polish Catholic youth, organized near Poznań in Lednica (near the Lednica lake, which is believed to be the place where the first Polish monarch, Mieszko I was baptized in 966).
As having origin in the Proto-Slavs, the two were pagan (Slavic religion) until forming of Christianity as state-religion; 867–886 in Serbia with the baptism of Mutimir (possibly by Eastern Christian Cyril and Methodius), and 966 in Poland with the baptism of Mieszko I (by Western Christian Jordan).