Sian Phillips was born in Betws, Ammanford, Wales. She married Peter O'Toole and they had two daughters, Pat and Kate, but she subsequently divorced him. She later married British actor Robin Sachs, from whom she is also now divorced. She has made many films and television programmes, but is probably best-known for her role as Livia in the BBC adaptation of Robert Graves' novel, I, Claudius. Phillips' West End credits include Pal Joey, Gigi, A Little Night Music, and Marlene, in which she portrayed Marlene Dietrich. She has also appeared on the American stage in Marlene. In June 2000, she was awarded a CBE in the Queen's Birthday Honours list.