Already the Sandomierz Agreement of 1570, which was an early expression of Protestant irenicism later prominent in Europe and Poland, had a self-defensive character, because of the intensification of Counter-Reformation pressure at that time.
Juba 1570. aasta Sandomierzi kokkulepe, mis oli hiljem Euroopas ja Poolas silmapaistva protestantliku irenismi varajane väljendus, oli enesekaitselise iseloomuga, sest sel ajal intensiivistus vastureformatsiooni surve.