"it was The Fatal Marriage"
The Fatal Marriage, or the Innocent Adultery, was a play by Thomas Southerne (1660-1746), an Irish dramatist who lived in London from 1678. His first play, The Persian Prince, or the Loyal Brother (1682), was based on a contemporary novel. The Fatal Marriage was a sentimental drama published in 1694. It was based on Mrs Aphra Behn’s The History of the Nun, with a comic underplot added by Southerne.