I wouldn't consider him necessarily historic in an important person kinda way, but Carl Tanzler. Mostly for how weird his story is, despite the whole obsession with a corpse thing. Man was a radiology technologist and fell in love with a wonen who was slated to die of tuberculosis because there wasn't a cure back then. Basically, from my understanding, somehow convinced the family to let him visit to try and cure her, despite not being the type of doctor who could. Ended up showering her with gifts, which seems kinda cruel to do to someone so close to death IMO.

I believe after her death, he paid for an above ground mausoleum for her and convinced them to give him a bag of her hair. Ended up visiting the corpse for a while until one day deciding to take it with him. Ended up, who knows how long later, getting caught with it. Police couldn't charge him with anything because statute of limitations or something similar, so all they did was take away the corpse. Man did, at one point, apparently make an effigy of her, even using the hair he got from the family to make a wig.

I'd say the story is more disturbing than anything, but that's weirdos for you.

Feel free to correct me if I got anything wrong.

Edit:

The wig was from before the police took the body. Also, no evidence of necrophelia, so only grave robbing would have applied, but statute of limitaions and all that.