Casimir I the Restorer
At the start of the 11th century the settlement was rebuilt (and enlarged) after suffering destruction caused by a flood, one of many which would periodically affect Poznań throughout history. In 1038 the invading Bretislaus I, Duke of Bohemia, sacked and burnt the settlement. It was rebuilt under Casimir I the Restorer, but the country's capital was now moved to Kraków, and the Greater Poland settlements of Poznań and Gniezno lost their primary political importance.