"Lover's Vows" (1798), a play by Elizabeth Inchbald arguably best known now for having been featured in Jane Austen's novel "Mansfield Park" (1814), is one of at least four adaptations of August von Kotzebue's "Das Kind der Liebe" (1780; literally "Child of Love," or "Natural Son," as it is often translated), all of which were published between 1798 and 1800. Inchbald's version is the only one to have been performed. Wikipedia
The definitive Wikipedia entry for Lovers' Vows. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Lovers%27_Vows
... Mansfield Park - Lovers Vows Austen for Beginners Home page Jane Austen Who was she? What did she write? Novels Pride and Prejudice Sense & Sensibility Emma ... www.austen-beginners.com/mansfield_park_loversvows.htm
... being familiar with the play Lovers' Vows , which is central to the climax of the first volume of the novel, but for the modern reader, it is easy to walk away wondering what all the fuss was... www.austen.com/mans/vows/