Okay so this lady tried to reincarnate her dead baby by having sex int he dead child's tomb. But I'm sure she wasn't a satanist.
Maud Gonne was also the muse and inspiration for the poet W B Yeats, who immortalised her in some of his most famous verses.
Some more weirdness:
It was the start of a mutually obsessive relationship that would last half a century. But what Yeats did not discover until very much later was that less than three weeks before this momentous first encounter, Maud Gonne had given birth to a baby boy.
The baby was called Georges, he was born in Paris, and he was Lucien Millevoye's.
Gonne - a complicated character if ever there was one - initially kept Georges' existence secret from Yeats. When he did find out about the baby, she insisted that he was not hers but adopted.
"It is surprising how naive Yeats seems to have been over Gonne's child," Toomey says. "He must have wanted to believe that what she said was true about it not being hers."
But two-and-a-half years later Georges was dead. It is not certain how he died, but it was probably meningitis.
https://www.bbc.com/news/magazine-31064648