What is the character's name, played by Diana Rigg in the 1965 - 68 TV series, The Avengers?

Dame Enid Diana Elizabeth Rigg, DBE (born 20 July 1938) is an English actress. She is known for the role of Emma Peel in the TV series The Avengers, which she appeared in from 1965 to 1968, and an extensive career in the theatre, including playing the title role in Medea, both in London and New York. For this role, she won the 1994 Tony Award for Best Actress in a Play. Considered a sex symbol she was made a CBE in 1988 and a Dame in 1994.

Rigg made her professional stage debut in 1957 in The Caucasian Chalk Circle, and joined the Royal Shakespeare Company in 1959. She made her Broadway debut in the 1971 production of Abelard & Heloise. Her film roles include Helena in A Midsummer Night's Dream (1968); Countess Teresa di Vicenzo, wife of James Bond in On Her Majesty's Secret Service (1969); Lady Holiday in The Great Muppet Caper (1981); and Arlene Marshall in Evil Under the Sun (1982). She won the BAFTA TV Award for Best Actress for the 1989 BBC miniseries Mother Love, and an Emmy Award for her role as Mrs. Danvers in the 1997 adaptation of Rebecca. Since 2013, she has played Lady Olenna Tyrell in the HBO series Game of Thrones, and played Sutton in the 2015-2016 Sky 1/NBC series "You, Me and the Apocalypse".