Before I attempt a brief survey of the numerous and varied examples of religious architecture in Poland let me mention a few well-known facts. Poland, having grown out of a tribal community, and having early developed a national character, after the Union with Lithuania (first a personal union in 1386 and then a State union in 1569) began expanding rapidly. At the turn of the fifteenth century a new model of parliamentary monarchy was established, a model functioning in an already multinational, federal state, which ceased to be the ‘Republic of Two Nations’ and became instead the ‘Republic of Many Nations’. I do not intend to analyse here all the achievements, changes, and mistakes of Poland, but I would like to stress that between the fifteenth century and the eighteenth century the Poles were in a minority. This minority, however, decided the country’s fate, as it was Polish noblemen (szlachta) who set the political and cultural pace. It has never been accurately assessed what percentage of the whole society the noblemen were, but it must have been high, probably the highest in Europe. According to some sources, the Poles who felt themselves free and regarded Poland as their commonwealth formed ten per cent of the whole population. We should also note that at that time the process of Polonization took place mainly among the nobility, and that the Poles who were in a minority in the Polish-Lithuanian State were at the same time a majority among those who ruled that State. I am not saying that as a Polish nationalist, but as an historian who has a deep respect and friendly feeling for all the nations and denominations which once inhabited this large and unique country. The Union of Lublin put the final touches to this distinctive commonwealth, which appeared too early in the Europe of nationalism and absolutism to survive.