966 of course, but it existed before also, this date indicated when Poland became christian, and was considered a kingdom since this time.
Poland began to form into a recognizable unitary and territorial entity around the middle of the 10th century under the Piast dynasty. Poland's first historically documented ruler, Mieszko I, was baptized in 966, adopting Catholic Christianity as the nation's new official religion, to which the bulk of the population converted in the course of the next centuries. I
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