Rose Williams is an English television actress born in London, England on February 18, 1994. She is best known for her role as Princess Clause Valuar in the CW historical television drama Reign. Williams is represented by United Talent Agency and Untitled Entertainment. She decided she wanted to pursue an acting career at 18 years old. Her earliest acting roles were in 2014 in the short films Sunroof and Tocks. She made her debut on television in 2014 on the show Casualty. That same year she became well known after landing the role of Princess Clause Valuar on the show Reign. In 2015 she made her debut in film in the British drama movie Chicken. She has also had roles in the films and television shows A Quiet Passion, Sanditon, Changeland, and Medici.