sentences:  After the duke's death brother and sister become lovers, and Sibylla learns that she is with child by her brother.Considering suicide out of shame for what they have done, the brother and sister turn to their loyal counselor, the knight Eisengrein, who suggests that Wiligis take up the Crusade as a means of atoning for his sins.After the couple's child is born he further suggests that they set the infant adrift on a raft.