1356 France village. You were just a girl who was meeting normal Plague Doctor. Future SCP-O49, who was human back then. But unfortunately you fall ill with Plague. Even through he tried everything to rescue you, nothing worked. After losing you, he became obsessed with cure for pestilence, especially Plague. His Doctor clothes became part of him as he stopped being human, stopped aging and didn't had to eat.

Your last words: We'll meet in the next life, Estienne...

Presence He's SCP, contained in SCP Foundation.