From the moment of Luther’s defiance of both Pope and Emperor at the Diet of Worms the sixteenth century became a period par excellence of cuius regio, eius religio, and of nowhere was this more true than for the very different societies of England and Poland. In England, for that time a highly centralized country, the nation’s religious fate oscillated wildly with the change of monarchs and their respective governments, mildly reformist under Henry VIII so long as Thomas Cromwell held power, indisputedly Protestant during the rule of the boy king, Edward VI, as indisputedly Roman Catholic in the equally short reign of Mary I, and then Protestant, as it turned out permanently, on the accession of Elizabeth. In Poland, where, because of its proximity to Wittenberg, Luther’s teachings began taking root at least within the German communities considerably earlier than in England, the spread first of Lutheranism and then Calvinism depended far more on the attitude of the nobility than of the monarch, though the succession of the more tolerant Sigismund Augustus in 1548 certainly accelerated the process. Apart from the five years between 1547 and 1553 in England, in neither country was life easy for converts to the Swiss version of Protestantism before 1560, and at different times both Polish and English Protestants suffered quite severe episodes of persecution: this essay traces the fortunes of the Poles who found a refuge in England and of the English who sought a temporary haven in Poland on account of their religion in the mid-sixteenth century.