Beatrice Rose Stella Tanner, better known by her stage name Mrs Patrick Campbell or Mrs Pat, was an English stage actress, best known for appearing in plays by Shakespeare, Shaw and Barrie. She also toured the United States and appeared briefly in films.

The St James's Theatre was in King Street, St James's, London. It opened in 1835 and was demolished in 1957. The theatre was conceived by and built for a popular singer, John Braham; it lost money and after three seasons he retired. A succession of managements over the next forty years also failed to make it a commercial success, and the St James's acquired a reputation as an unlucky theatre. It was not until 1879–1888, under the management of the actors John Hare and Madge and W. H. Kendal that the theatre began to prosper.