Lady Rhondda, otherwise known as Margaret Mackworth, is one of those revolutionary figures whose groundbreaking work for women’s rights in the first half of the 20th century has largely gone unrecognized. She headed the Newport branch of the Women’s Social and Political Union, fought for a seat in the House of Lords, went to prison for setting fire to a postbox, became a successful business leader and founded one of the most eminent political and literary magazines of her time.