The 1620s witnessed the most intensive re-Catholicisation efforts in Bohemia. The article focuses on the course of re-Catholicisation in royal towns, the population of which represented a relatively enclosed group of people living under the same legal norms and was the first subjected to forced religious conversion.
A comparison of the course of re-Catholicisation at several locations made it possible to identify identical characteristics in the measures taken by local officials and in the defensive strategies of burghers; certain regional differences were also discerned.