What is dramatic poem set in a gothic castle?

"The Castle of Otranto" by Horace Walpole is considered to be the first gothic novel, and it is indeed set in a gothic castle. It tells the story of Manfred, the lord of Otranto, who becomes embroiled in a series of supernatural events after he tries to usurp the rightful heir to the throne. The novel is full of suspense, horror, and romance, and it is widely regarded as one of the most influential works of gothic literature.