Explain the cause of the feud between the von Grandwitz and Znaeym families.

The feud between Ulrich von Gradwitz and Georg Znaeym was caused by a dispute over land. The strip of land in question was judged to belong to the Gradwitzes by the court..... the Znaeyms did not accept the court's decision. Both men still claim the land as their own, which leads to a meeting between the two as they sit in wait one for the other, each of them bent on murder.