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In page Rudolf I of Germany:

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Rudolf paid frequent visits to the court of his godfather, the Hohenstaufen emperor Frederick II, and his loyalty to Frederick and his son, King Conrad IV of Germany, was richly rewarded by grants of land. In 1254, he engaged with other nobles of the Staufen party against Bertold II, Bishop of Basle. When night fell, he penetrated the suburbs of Basle and burnt down the local nunnery, an act for which Pope Innocent IV excommunicated him and all parties involved.[citation needed] As a penance, he took up the cross and joined Ottokar II, King of Bohemia in the Prussian Crusade of 1254. Whilst there, he oversaw the founding of the city of Königsberg, which was named in memory of King Ottokar.