Who is Calpurnia from Caesar's Women and what is their importance?

Calpurnia is Caesar's third wife and the daughter of Lucius Piso. Caesar marries her to secure an alliance with her father. Young and naive, Calpurnia is initially afraid of her husband. Caesar, however, is very sweet and gentle, spoiling her with gifts. Calpurnia is aware of Caesar's affair with Servilia, but she naively believes that he loves her.