Lucilla, it turns out, is subject to a mild form of erotomania and is constitutionally fickle, so that before her new lover has begun to realise his bliss she has already contracted a passion for some other young gentleman.
"John Lyly"
John Dover Wilson
The most extravagant phase of romantic love which has ever been seen was then brought about, and in many cases, certainly, it was a real erotomania which passed beyond the bounds of sanity.
"The Task of Social Hygiene"
Havelock Ellis