Dame Enid Diana Elizabeth Rigg was an English actress of stage and screen. Her roles include Emma Peel in the TV series The Avengers (1965–1968); Countess Teresa di Vicenzo, wife of James Bond, in On Her Majesty's Secret Service (1969); Olenna Tyrell in Game of Thrones (2013–2017); and the title role in Medea in the West End in 1993 followed by Broadway a year later.

Emma Peel is a fictional character played by Diana Rigg in the British 1960s adventure television series The Avengers, and by Uma Thurman in the 1998 film version. She was born Emma Knight, the daughter of an industrialist, Sir John Knight. She is the crime-fighting partner of John Steed.