Since the 1820s the ruins of a monumental building on Ostrów Lednicki (near Gniezno) have been a subject of interest both of lovers of monuments of the past and representatives of various historical disciplines.The building was built of local erratic boulders on one of the islands of Lednickie Lake, within the large earthworks and wooden fortifications, dendrochronologically dated on ca. 960. It was the time of the first Polish ruler - Mieszko I who, having accepted baptism in 966 by means of his wife Bohemian princess Dobrava, laid the foundations for Christianisation of his country. With this married couples and their son and successor Boleslaw Chrobry (Boleslaus the Brave) the later, rather unreliable sources associated the stronghold on Ostrów, although they did not mention the stone buildings.The present text is an attempt to remind and present what exactly could be legitimately used as a basis for inferences about the original shape, function and building time of these buildings. The stronghold on the island of Ostrów Lednicki, conquered and destroyed during the Bohemian invasion of 1039, had never regained its initial significance.Hence the conclusion that the ruins of stone building had been made before that date. The building, or actually a complex of two buildings: a chapel on a central plan of reduced cross octagon coupled with elongated residential building, could not be dated back much. It is testified by the remnants of a twin building complex at Giecz, the building of which was interrupted at the initial stage in connection with the same invasion of 1039. The 'terminus post quem' is determined by a stray find of a coin of Holy Roman Emperor Otto III preserved in the limestone mortar of the Chapel.This layout, storied has its closest analogies with the residences in the territory of the Otto's empire, as well as in Bohemia and Hungary of the first half of the 11th century. In the author's opinion the theses that the typical complex of 'palatium' and chapel was to perform a function of the seat of a missionary bishopric and baptistery, are unfounded both in the light of historical facts and architectural layout. Similarly unfounded are the assertions that this architecture originated in Lombardy and was built at the times before the so-called Poland's baptism of 966. Of mythopoetic character are numerous other hypotheses evoking alleged stays of various personalities known from the historical sources.
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