Final answer:
The important background knowledge regarding the Brown-Simpson marriage includes the trial for enchanting a rich widow in marriage and the local opponents in court, which included the young stepson and the family of the previous husband.
Step-by-step explanation:
The important background knowledge regarding the Brown-Simpson marriage includes the trial for enchanting a rich widow in marriage and the local opponents in court, which included the young stepson and the family of the previous husband. This information sheds light on the circumstances and challenges faced by Brown-Simpson during their marriage.