Kathalina Petrolo is a descendant of the former Volturi guard Felix and the ancestor of for Lia and Olivia.
Kathalina was born in Itlay in 1475 and was born into a wealthy merchant family, who then disowned Kathalina in 1492, due to her having a illegitimate daughter in 1490 with an unknown man.
She carried the child to term and gave birth to a healthy girl. The child as taken away seconds after she was born, leaving Kathalina devastated. Her her then forced her to become a nun and join a convent in order to repent for her "sin".