Riona Nerissa Summers is a vampire, member of the Volturi coven and a student New Moon high school, located in the almost unheard of Breaking Dawn village.
She was born somewhere in the countryside of the medieval England and had norse and celtic roots.Daugher of a noble family,she was raised in wealth.Her father was Duke of Cornwall and had great influence on the king.She was supposed to marry the heir of the english throne when she'd had reached the age of twenty.Only a few weeks before,she met a young man,more handsome than anyone else she'd ever seen.She instantly fell in love with him,but before she could realise it,he led her to an old,abandoned forest at a moonless night and began drinking her blood.But suddenly,he heard noises and ran away,leaving Riona bleeding in the forest.Somehow,she managed to survive the blood loss and become the ruthless vampire she is today.
She spend centuries as a nomad in Europe. She was known of seducing young men with her stunning appearence and draining of their blood.
At 2010, while she was in Italy, she came across with the Volturi coven, who asked her to be member of their guard. There, she met other two new members, named Marina and Hornet. They soon became close friends and they named themselves sisters. While being member of the Volturi, she met another vampire, Demetri, at whom she had a crush on. Demetri orinally had a crush on Heidi, but when she saw Riona's astonishing beauty, he fell in love with her and they became mates.