Plan a campaign

You head to your chambers. Once inside, you sit at your desk and sift through papers. You happen across an aged document. One you had requested to be delivered to you. It's from the deep archives, from an era long since passed. The document dates back to the reign of King Awyr, Arthur's grandfather. It's a decree that ended the feuding between the knights back then. It details that one may consummate the allegiance of a rival by wrestling, or by offering their heir to the rival. The challenge of wrestling cannot be declined and to the victor goes the loser's allegiance. Alternatively, if a rival is to accept the heir, they pledge their to allegiance to the progenitor. Both options are perfectly viable. All you must do is choose one.