The wife was in love with the knight who lived next door. They were up all night every night looking at each other and exchanging gifts.
They exchanged gifts with by throwing them across the gap. Which solidified their love for each other.
the author sets the stage by describing summer and saying "The birdie all his sweet notes showersIn joyous play on the sweet flowers." The bird will be importnt in the themes of the story.
The relationship between the two is strong based on how the author says "To her friend waiting there, she knew;For both their lives were just the same,They waked all night till morning came.The rapture of looking made them so glad(That rapture the only one they had). "
we get more insight into the wife's husband when he "Laughed, cruel, angry, at what he heard. He made his plan, which must not fail:He would trap the nightingale."
we also get some insight on the other knight when "He ordered the best smith to moldA tiny vessel, all pure gold (No iron or steel), and good stones, Precious ones, expensive ones, And make a good tight-fitting lid.Inside, the laustic he hid."