Sentence:  Religion played a central role in the making and application of <WSD>fetial</WSD> law. Thus, according to Frank, <WSD>fetial</WSD> law was based upon “the oath of good faith that was spoken upon the making of the treaties as well as the oath of innocence taken when war was declared”. 
Meaning of the word marked with <WSD> tags:  Concerned with declarations of war and treaties of peace.