Marya Markovia

Marya Markovia is one of the people buried in the catacombs beneath Castle Ravenloft that is mentioned in both Ravenloft I6 and House of Strahd. In life, she was loved by Endorovich the Terrible, but she loved another. Jealous, Endorovich attempted to poison Marya's lover but instead poisoned Marya herself. The lover took the blame and was hanged, but Endorovich's guilt drove him mad. Her tomb has been defaced by claw marks

The details of Marya's existene are slightly different between versions. In I6, she is simply deceased In House of Strahd, she is a vampire sleeping in the catacombs beneath Castle Ravenloft. How she might have become a vampire after dying of poison is not mentioned.