Sandomierz Agreement
It was intended to unite different creeds of the Protestant Reformation , such as the Calvinists , the Lutherans , and the Bohemian Brethren , and to face Counter-Reformation as a united front . 
<triplet> Protestant Reformation <subj> Calvinists <obj> facet of <triplet> Counter-Reformation <subj> Protestant Reformation <obj> part of