H. P. Lovecraft
Howard Phillips Lovecraft (US: /ˈlʌvkræft/; 1890–1937) was a protocel American writer of horror and weird fiction, who is chiefly known for being the creator of the Cthulhu Mythos. He was likely incel for most of his life, and almost certainly a virgin until he was 31. Lovecraft was a hermit, rarely leaving his house, perhaps due to the influence of his controlling, spiteful, insecure mother, who had chided and nagged him constantly throughout his childhood and commanded him to avoid leaving the house to avoid offending his neighbors with his supposed ugliness.
Like many incels, Lovecraft was frequently accused of prudishness due to his obvious aversion towards the discussion of sexual matters in his presence. Some of Lovecraft's 'friends' used their knowledge of this fact to tease him, often by frankly conversing about sex whenever he was around.
He eventually met an older, Jewish widow (though Lovecraft was known for his anti-Semitic views) to whom he was married to for two years before they eventually divorced, seemingly mostly due to Lovecraft's trenchant refusal to relocate to his wife's new place of employment, due to his disdain for the city of New York, which was a hub for immigrants, whom Lovecraft despised. Despite being a wizard at the time of his marriage, his ex-wife later described him as an attentive and accomplished lover, with Lovecraft apparently even going to the trouble of extensively researching sexual techniques and the female anatomy prior to consummating the marriage.