According to 20th century scientist Emil Natas, he lived a past life as the wizard Diablo Natas in the year 1313 AD. He terrorized the countryside until he was stopped by Captain Amerigo and Bucky, the apparently the 20th century heroes Captain America and Bucky in past lives as well.
Dafydd ap Andras was born in a small village south of Wales. Dafydd's mother died in childbirth, and he began to manifest powers at birth. In 1347, many of the townspeople blamed him for failed crops, plagues and called him a demon. Wanting to end the plague effecting the village, the townspeople demanded to sacrifice him. When Dafydd's father, Andras Tryp, refused to give in to the townspeople's demands, they set fire to their home, killing Andras and nearly killing Dafydd who saved himself by teleporting away from the home with help from his older self.
In Crimea, the Proto-Mutants who lived as a tribe apart from the local humans were immune to the Black Plague. As the humans spotted that immunity, their fear and anger grew. They captured and killed Proto-Mutant Ister's sister, possibly drinking her blood, seeking for a cure. The Proto-Mutants retreated further into the hills but were slaughtered by the humans and buried in a mass grave near Kuryk, Kazakhstan, off the Caspian Sea.