Sister Monica Joan
played by Judy Parfitt
Born into a leading titled family, Sister Monica Joan was one of the first women in Britain to qualify as a midwife. In the closing years of the 19th century, this was seen as a radical act. Her additional decision to become a nun scandalised her relatives, who never came to terms with her life choices.
She dedicated her entire adult life to providing midwifery services to the poor of the East End. Now in her 90s, Sister Monica Joan has retired from practice, but lives full-time at Nonnatus House, cared for by her fellow sisters. She has an eccentric, mercurial personality, and is obsessed with cake, astrology and knitting, in no particular order.