They are two younger sons who had traveled to Lichfield, hoping that one of them would wed an heiress.  
The innkeeper and the thief Gibbet become convinced that the title characters are highwaymen, while Mrs. Sullen is certain that they are not who they pretend to be.  They are two younger sons who had traveled to Lichfield, hoping that one of them would wed an heiress.  Archer courts the innkeeper's daughter Cherry, while his friend seeks the hand of Mrs. Sullen's sister-in-law, the local squire's daughter Dorinda, whom he marries when his brother dies and he becomes Lord Aimwell.  FTP these are the events of what 1707 play by George Farquhar?
The innkeeper and the thief Gibbet become convinced that the title characters are highwaymen, while Mrs. Sullen is certain that they are not who they pretend to be.  
The Beaux' Stratagem