Who is Dame Juliana from The Reckoning and what is their importance?

Dame Juliana is Ellen's lady-in-waiting. She is in love with Bran, and when Bran dies, Juliana can find no solace. She is devoted to Ellen and follows her to Wales. Beautiful and voluptuous, Juliana is adored by many suitors, but she shows no interest in any of them. She mourns for Bran and gives her life in service to Ellen. Juliana returns to France after Ellen's death, and finally marries, twelve years after Bran's death.