Jane Austen must have seen many plays performed in the Theatre Royal in Orchard Street, Bath, during the five years she lived there. Good actors from London regularly appeared. Lovers' Vows was given six performances at the Theatre Royal while she lived there, so she must surely have seen it.
The Theatre Royal was small, box-like and intimate: it must have been very easy for Catherine (in Northanger Abbey) to look across at the Tilneys’ box.
The plot of Lovers' Vows involves seduction by a baron, illegitimacy, desertion and the baron's son unwittingly drawing his sword on his father. The baron's daughter is courted by the foppish Count Cassel but loves – and is loved by – her tutor, Anhalt.