Well Gothic horror was around for over 50 years before Frankenstein.
The first work to call itself Gothic was Horace Walpole's 1764 novel The Castle of Otranto, later subtitled "A Gothic Story". Subsequent 18th century contributors included Clara Reeve, Ann Radcliffe, William Thomas Beckford and Matthew Lewis. The Gothic influence continued into the early 19th century, works by the Romantic poets, and novelists such as Mary Shelley, Walter Scott and E. T. A. Hoffmann frequently drew upon gothic motifs in their works.
https://en.wikipedia.org/wiki/Gothic_fiction
That said, I don't know if books like like The Castle of Otranto and The Monk (1796) are that well known today, vs. something like Dracula.
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